Questions tagged [fuel-consumption]

Use for questions related to fuel economy.

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4answers
89 views

how much does it cost to turn off the ignition to save gas?

Sometimes I am sitting in certain types of traffic where there are lines of cars that don't move for a minute or more then only move forward a couple car lengths. This is not on a highway but in ...
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1answer
60 views

Is my exhaust causing misfire or did misfire burn the exhaust?

I hope to not be too vague as I don't know a lot about cars. I recently purchased a 1.2L Fiat Punto II 2005. It has trouble with a rough idle, a power drop off around 4krpm when accelerating and a ...
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0answers
37 views

Why Long Term Fuel Trims Remains in Negative?

Dear Experts here im attaching log of 1SZ-FE, 1.0L engine for your kind consideration, please advice why my LTFT remains in -ive though MAF, Intake Air Temp sensor, ECT sensor and O2 sensor is working ...
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0answers
47 views

How does engine braking mapping work?

Some recent cars and a lot of bikes can change engine mapping and change engine braking electronically. For instance, my bike is not an automatic bike, so it has mechanical gears and I am able to ...
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0answers
25 views

Speedometer and Odometer not reading, bad fuel consumption

I have a 1995 model Toyota RAV4 automatic transmission. The speedometer and Odometer sometimes works, sometimes doesn't. What could be the problem causing this erratic behaviour. The same car consumes ...
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1answer
61 views

Why is fuel going down quicker than expected giving miles driven?

Given the pandemic lock downs and such I've been using my car less, maybe 2 times a week and when I do drive it is for short drives, 5 miles or less usually. But it seems like each time I get in my ...
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2answers
901 views

Do oxygen sensors degrade over time or just break?

I have a BMW E46 M3 with 100k miles that's smelling rich when cold and seems to be getting worse mileage than it used to. It has passed the UK MOT emissions check recently, the plugs seem fine and I'...
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0answers
28 views

MAF sensor problem?

i have a 2012 vauxhall Zafira 1.7cdti ecoflex motor which has low mpg, i have tested for obd2 codes but there are none,live tests show MAF sensor readings fluctuating from 7.9 to 15.11 g/S on tick ...
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1answer
66 views

Load in higher gear vs fuel consumption

I saw a video explaining that put the car in higher gear where possible to avoid high revs thus maximising mileage, this lead a thought in my mind about what happens if the revs are low and gear is ...
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1answer
667 views

Potential for failing PCV valve causing intermittant p0420 (catalyst efficiency below threshold)

The car is a 2002 Honda CRV with the 2.4 VTEC engine. Had it about two years, and I've done a fair amount of maintenance on it at this point. It's got a nagging, intermittent p0420 code. And ...
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60 views

Can transmission replacement affect fuel economy?

I recently had the transmission replaced in my 2009 Dodge Grand Caravan. This is my third Dodge minivan, and all of them averaged around 17 mpg in mostly city driving. However, when I got this van ...
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6answers
8k views

What is most fuel efficient at 130km/h? [duplicate]

Suppose a very hot summer day, driving on a long straight highway at 130 km/h. What is most fuel efficient solution : Driving with AC on and closed windows? Driving with AC off and four full opened ...
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1answer
140 views

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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35 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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0answers
34 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
78 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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468 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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4answers
856 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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1answer
163 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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1answer
470 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
364 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 or ...
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0answers
147 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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2answers
2k 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
50 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
109 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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0answers
86 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
41 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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2answers
2k 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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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
1k 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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1answer
118 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
67 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 top of ...
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1answer
63 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
1k 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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0answers
36 views

Mitsubishi Montero limited Have EXCESS FUEL consumption

My Fairly used Mitsubishi Montero limited 2000 model has excess fuel consumption like 30litrs per 100km Accompany with very hot interior under the feet even with a c on though vehicle not doing ...
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0answers
34 views

Sudden Oil consumption increase

There is increased oil consumption in a 2009 chrysler 300c that has the 5.7 Hemi motor .There are no oil stains on the garage floor .There is an apparent fuel consumption increase which we ...
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0answers
62 views

New plugs, but problems starting (not firing on all cylinders) and poor fuel economy?

Car is a '93 Mk1 VW Cabriolet, 1.8lt injected. The car has had trouble starting - feels like only some of the cylinders are firing. If I rev the engine a little the problem goes away after a few ...
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2answers
1k views

2007 Honda Shadow Aero 750

I have a 2007 Honda Shadow Aero 750. I bought it in 2014. (My first motorcycle) I have intentionally run it till I had to switch to reserve to check how many miles I can go on a full tank. The first ...
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1answer
1k 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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2answers
48 views

Car Scanner tool and output

I am pretty green in this field. Recently, I have bought a Honda Civic 2007 and planned to investigate its condition out of my curiosity. I bought a OBD-II tool and scanned my car. To my surprise, I ...
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2answers
2k 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
882 views

Non-Turbo vs Turbo at Altitude and loss of power

I am going to be moving from sea level to 7,000 feet and at the same time replacing my 02 Accord with something else so I am looking around at all sorts of options. I know that at altitude an internal ...
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1answer
744 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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1answer
675 views

Am having too much fuel consumption on my Toyota Carina e 1994 model. Please what is the causes?

Having high fuel consumption on my Toyota Carina e 1994 model. Please what may be the causes?
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1answer
143 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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2answers
99 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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1answer
186 views

Bajaj discover 125(2011model) runs like always giving reserve fuel warning even when fuel is sufficient

I have Bajaj Discover 125 (2011) model which has always been taken care by me. as i dont ride bike much it only ran upto 20,000 km till now in plains. (Punjab). Everything was fine and the bike ...
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2answers
6k views

Can an exhaust leak cause bad MPG?

One of the connections between the exhaust downpipe and DPF filter is leaking (I guess the gasket may be the problem). Recently the leak got a little bit more obvious, I can hear it when reving the ...
2
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1answer
88 views

Suddenly milage dropped and engine started working differently

I have suzuki access 125. Cc:125 Body Type: scooter Engine Type: single cylinder 4 stroke(SOCH) Fuel system: carburetor (ucal cv)(vm18-258 * i don't know what it means but found on ucal website) Fuel ...
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0answers
54 views

Car sometimes starts rough, almost stalls when coming to a stop, poor fuel mileage

I have a 2013 Chrysler 200 LX 2.4L 4speed automatic. Last summer it occasionally had difficulty starting. One in every few starts it would start rough. Now I've noticed recently it seems like it's ...

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