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Questions tagged [fuel-consumption]

Use for questions related to fuel economy.

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Mitsubishi Pajero IO fuel

Which is the best fuel to use for Mitsubishi Pajero IO with the below specification: MODEL: GF-H66W MRXC ENGINE: 4G93 Unleaded 95 ,Unleaded 98 or anything else?
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24 views

fuel consumption and high ravs

I changed the sub assembly for my toyota altezza but now its consuming too much fuel and now the rav count will at 2000rpm at low speeds 20-60km/h, it had an engine check light for knock sensor and ...
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3answers
11k views

How much fuel does it take to start an engine?

I appreciate this is a question that can't be answered in facts and figures, so I'm after a general idea. I drive a 1986 Supra, which has a modest 2.8-litre engine. I often shut the engine off while ...
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3answers
361 views

Does a black car have worse fuel consumption?

As we all know, in hot climates part of the engine's output goes to power the AC compressor. Now, in such a climate, if your car is painted black, it should absorb more sunlight, and therefore, ...
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1answer
43 views

Land Rover Freelander 2 - Bad MPG

2007 Freelander 2 Was having what I consider bad MPG for a diesel, averaging around 23-24mpg Initially thought it needs a service, so lots of money later for a full service which would have ...
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2answers
18k views

Higher than normal fuel consumption - What could be the cause?

My 1997 VW Golf 3 is over-consuming fuel, I use 10 liters for 45km, My mechanic ask me to change the automatic gear-box because it is not selecting gear above gear 3 I change the automatic gear-box ...
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4answers
5k views

Does flooring the throttle while traveling at lower speeds increase fuel consumption?

I've noticed that in a manual transmission vehicle when going uphill I have two options: Downshift and press the gas more Stay in the same gear and press the gas more I haven't measured it but ...
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27 views

Seeking information on the accuracy of average Fuel Consumption shown in Instrument Console?

If the speed shown in a motorcycle's instrument cluster is off by let's say ~5 km/h relative to the actual speed, can we say that the average fuel consumption it shows is also prone to show wrong ...
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1answer
73 views

Wheel covers for '95 civic EG with drum brakes

So I have a 1995 Civic hatchback with drum brakes. I am thinking of adding wheel covers (also called moon disks). Would this affect the drum brakes the same way it can sometimes affect disk brakes? ...
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2answers
754 views

Calculating fuel flow rate through obd || sensor not supporting 015E and 0110 commands

I have been working on a project where i want to calulate fuel flow rate using data from the obd2 sensor. The car on which i was testing didn't support the pid 015E which is for fuel flow rate. Then i ...
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1answer
635 views

How to calculate fuel consumption and CO2 emission on flex fuel cars using OBDII data?

Here is the thing: I'm trying to estimate the fuel consumption of cars using OBDII data. It's quite simple if we can treat each fuel and its stoichiometric air fuel ratio separately, but when it turns ...
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1answer
57 views

2004 Audi TT 1.8 poor MPG

I have Audi TT 1.8 04 plate My average miles is 50/60 per week. However I don’t seem to get many miles for a fuel tank. Average 210 for £60 fill up. What could be the problem ?
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1answer
54 views

How many L/km does removing a spare tire save? [closed]

My grandparents in Toronto, Canada merely drive in the GTA, and don't need their spare tire in their car's trunk, as they don't know how to replace a tire and would merely call roadside assistance if ...
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1answer
112 views

Which value should takes to show Gauge value, Fuel pressure or Intake Manifold Pressure?

Currently, I'm working on an app which should show Gauge value (inHg) of the vehicle using OBD reader. Which values should I use to show the Gauge? Is there any formula?
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1answer
1k views

My Toyota Corolla 2009 Le 1.8l fuel consumption too high

I run my car in normal use in highway and no traffic I spend $20 full tank 90 miles I replace my tires,spark plugs Oem ,Transmission fluid with filter,Engine oil with filter,Thermostat,antifreeze,Air ...
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1answer
105 views

2001 Vw beetle 02 sensor car will not go over 65mph

I have a 2001 vw beetle 2.0 engine with 171,000 miles on it. I have a check engine light on saying that bank 1 lean. It has been like this for years and I have had no problem with it. Yesterday I ...
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1answer
718 views

Short term fuel trim shows -9% (Rich)

Honda Civic 2007 90km odometer Problem- Fuel consumption I have scanned my car and it shows STFT -9% along with below parameters. Coolant temp -> 64 LTFT -> -7.03 Oxygen sensor voltage -> .55v EGR ...
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1answer
40 views

oil light flash while pressing gas

I have Hyundai i30 2008, i have changed crankshaft sensor 1 week ago. two days ago i start hearing some noise from motor while in idle and also while moving. Today the check engine light turned on and ...
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0answers
83 views

OBDLink Settings for Fuel Economy

Specs: App: OBDLink v5.4.1.1072 (iOS) Adaptor: OBDLink MX+ (bluetooth) Vehicle: 1999 Ford F250 7.3 turbo diesel (Aug 98 Production) Have been working with this Scantool for a couple weeks now, by ...
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1answer
525 views

Driving down hill in gear without throttle

I have read in an article that when the car is in gear instead of being in neutral while driving downhill, the pistons in the engine are being "rotated" by the rotational speed of the wheels. When ...
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4answers
98 views

Can spark plug wires affect fuel consumption

I am experiencing a drastic drop in mileage so far everything seems fine with the car so I cannot find the reason for now, but recently I replaced the spark plug wires I think it's unlikely that they ...
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0answers
43 views

Why are my oxygen sensors staying at 1.275v most of the time?

I have an old Volvo s40. Because I had gotten a P0420 code and because of it, an OBD scan tool, I noticed that my fuel trims were very high. Or they could be the result of the age of the car (17 years ...
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2answers
111 views

Motorcycle - 2009 Yamaha Vstar 950 tourer - fuel overconsumption

Let me clarify first, I am no mechanic and this is my first owned bike (newbie). I bought my bike (Yamaha VStar 950 tourer, 2009) last year, it was pre-owned. I noticed that whether I drive in cold ...
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0answers
45 views

How to calculate accurate fuel consumption for Diesel engine by using OBD data? [duplicate]

Can you recommend formula for calculating fuel consumption using OBD data for diesel engine? I find a article(http://www.windmill.co.uk/obdii.pdf) about fuel calculation using vehicle speed and MAF(...
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1answer
773 views

Volvo 2.0D engine “self-oscillates” after changing timing belt and adjusting fuel-injectors

I recently had the timing belt and water pump changed on my Volvo s40 (2006 2.0D diesel). The mechanic also cleaned and adjusted the injectors. After the service I noticed that att some rpms the ...
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2answers
145 views

Should diesels in general be run at higher rpm than gasoline cars?

I have always had gasoline cars, for which it appears (based on advice from other motorists and from fuel consumption meter), that it is advisable in general to run them between 1500-2000rpm. Going ...
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1answer
39 views

Civic Bad Mileage

I have honda civic 98 with D16Y4 engine and auto transmission.I'm getting low mileage 9-10km/L without a.c, driving with light foot with rpm between 2k-3k. I avoid long idling, drive within city ...
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3answers
67 views

Will a carbureted engine have different fuel consumption rates based on external load, with the same RPM?

I have a small Briggs and Stratton Model 19 engine, net power of 10.0 HP. If I ran the engine at full throttle without any external load connected to the output shaft, would it consume the same amount ...
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2answers
678 views

KIA Sedona 2003 Diesel Intercooler Turbo Low Fuel Mileage

I have a 2003 a Kia Sedona turbo diesel 2.9L, with intercooler. I am getting 5 km per liter of diesel consumed. I also have to do oil change and ATF replacement. I got the car 3 weeks ago. What are ...
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3answers
5k views

Realistc V8 fuel consumption and values displayed on vehicle instruments

My 2017 Grand Cherokee with the 5.7 "Hemi" V8 shows me instantaneous as well as average fuel consumption in a dashboard display. I am recording distance driven between refuelings and quantity pumped, ...
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61 views

LTFT zero on mazda cx7 2008 + high fuel consumption

I have this Mazda CX7 2008 2.3L turbo, and am experiencing the following: LTFT is zero, no matter what conditions I drive the car on. Gas consumption is high: ~22L/100km (10.6 MPG) DTC P2006: Intake ...
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2answers
30 views

Eco OBD2 Range Rover Sport Battery Issue?

I installed an Eco OBD2 and within 24 hours had a battery warning light showing and as the car is over 4 years old assumed that the battery was coming to the end of its life. I removed the Eco OBD2 ...
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1answer
1k views

Why does my 2005 Mitsubishi Pajero use excessive amounts of fuel?

I have a Wagon with excessive fuel consumption. It's using 30 litres of petrol per 100 ks. I have seen many mechanics who can't find the problem. I know it has good intake and no exhaust problems. ...
5
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3answers
1k views

Is manual start/stop good on older cars?

I have an old car (but with electronic injection) that predates by far start/stop systems which are used nowadays to save fuel (turning off the engine brings savings after 3-5 seconds, see Calculating ...
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6answers
13k views

What makes two-stroke engines less fuel-efficient than four-strokes?

It is a commonly-held belief that two-stroke engines are less fuel-efficient than four-stroke engines, and some example BSFC figures appear to confirm this as well. But what is it that causes two-...
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1answer
1k views

Is it possible that fuel consumption increases after changing an alternator?

I had a fault with my alternator and I went to the workshop where they tested one alternator and it didn't work probably. That engine was shaking and sparking. But then they tried another one and it ...
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2answers
994 views

Relationship between torque, power, specific fuel consumption, and AFR

How does Torque, power, and specific fuel consumption change with AFR? And why is it so? I found graphs relating these in books as well as websites but I couldn't find any good explanations.I have ...
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1answer
51 views

Do cars manufactured after 2018 have an alternative more reliable fuel gauge?

This presents two reasons for standard fuel gauges' imprecision: In the sending unit, the fuel has to drop below a certain level before the float starts to drop. When the float is near the ...
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0answers
29 views

Trucks fuel economy dependence on weather

I am searching scientific data and studies on the link between weather and fuel consumption in HDV (heavy duty trucks). For now I have found almost nothing. Can anyone help?
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4answers
251 views

Does a more powerful engine use less fuel for a specific load than a less powerful engine?

A colleague told me about a truck driving in the mountains. He said if the engine is too small, it would use more fuel to pull the truck up than if the engine were larger, noting the reason is the ...
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6answers
135k views

What to check if fuel consumption is too high?

I think my car is consuming much more fuel than it should, I've compared it to other versions of the same model which have more powerful engines and mine seems to be on the higher end when is supposed ...
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1answer
66 views

Premium vs plain gas consumption on long trip [duplicate]

I mostly ride my motorcycle on long trips distances of 200-250km with an average 100-120km/h speeds and using almost exclusively premium gasoline. My motorcycle is a Yamaha Fazer which does not ...
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1answer
58 views

How can you guarantee that your rental car won't use unreasonably more fuel?

After more than 50 rentals, my grandpa and grandma have noticed that Enterprise CarShare's cars match manufacturer's advertised fuel economies, but Enterprise Rent-A-Car's are much lower: As an ...
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3answers
444 views

Would restricting air intake reduce fuel consumption?

I own a Yamaha YS125 which is fuel-injected, and a lot of times I am flogging the bike on full throttle, which increases fuel consumption. I was thinking of restricting the air flow intake of the ...
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2answers
5k views

Fuel consumption is bad

I currently own a 2010 Honda Civic 1.8L and a 2012 Honda Jazz(Philippines) / Fit (USA and Japan) 1.5L. I just purchased a second hand Jazz/Fit about 2 weeks ago and the mileage is 32xxx. Btw we use ...
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1answer
363 views

Diagnosing a p0420 code for 2005 nissan x-trail 2.5L

I own a 2005 nissan xtrail with a 2.5L engine (QR25DE). I have problems with my vehicle, too much fuel consumption ( 3.8km/L ) My car has a 60Liter tank , my last fuel up gave me 229KM until the ...
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2answers
1k views

Mazda3 2013 Skyactiv-G 2.0, after 3 years using 5w40 is it Ok to lower the grade (thinner oil like 5w20 or 0w20) as recommended by manufacturer?

Context Mazda 3, US version, model 2013, Skyactiv 2.0 engine, gasoline, hatchback, manual transmission. I got the car from the US with 24,000 miles and 0w20 Penzoil full synthetic on it, according ...
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2answers
67 views

Will oil consumption decrease well before a check engine light tells you you have a problem?

I had a check engine light come on due to a o2 sensors which were giving a slow response but this was actually caused by a leaking flexi pipe which had been there for some time. This case can lead to ...
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2answers
3k views

2008 Toyota Corolla 141 Fuel Consumption Too High

I recently got a Toyota Corolla 141. The petrol consumption is too bad. It does only around 7.5-8 Km/l. Could you please let me know the reason behind this ? I was told that the vehicle is too heavy ...
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4answers
2k views

How much efficiency is robbed from 'pumping loss,' if any?

I'm specifically referring to the loss due to the pistons pulling air through a mostly closed throttle while cruising at highway speeds in a gasoline engine. To give an example, I've always wondered ...