Questions tagged [fuel-consumption]

Use for questions related to fuel economy.

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56 views

Chip tuning simultaneously decreasing fuel consumption and increasing performance

Recently, I came across the webpage of a tuning shop where the shop claims that by doing chip tuning they can simultaneously achieve superior performance and less fuel consumption (based on how they ...
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0answers
28 views

How to arrive to an instantaneous estimation of fuel consumption using OBD2 ELM327 parameters [closed]

Problem details Hi my friends, i'm working on a project in vehicles field, and i want to make a system to estimate number of fuel litters consumed in each second or any time unit, using the OBD2 ...
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1answer
41 views

Camshaft valve clearance and fuel consumption

Does the clearance between the camshaft and the top of valve tappets (AKA lifters AKA shims) affect fuel consumption? I am asking because it seems to me like the lesser the spacing, the more the cam ...
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36 views

Do you need a car's manual to determine the size of its tank?

What is an easy way to compare car models for the longest trip length that can be taken on a full tank? Electric cars are highlighting the biggest advantage of gasoline-engine cars: most electric cars ...
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1answer
68 views

Gas consumption when engine braking [motorcycle]

I am trying to figure out how much gas an engine uses when engine braking in a four-stroke engine (motorcycle). I understand that the gas consumption should be close to zero because the wheels are ...
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0answers
40 views

Rav4 2015 Limited Edition high fuel consumption

I bought a Toyota Rav4 AWD 2015 Limited edition since 1 month and it's consuming a lot of fuel: about 17L/100Km in the city which is a high number for 4 cylinder SUV no? What could be the issue?
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4answers
95 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
70 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
43 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
52 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
31 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
75 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
994 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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34 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
128 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
952 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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100 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
214 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
80 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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581 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
1k 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
203 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
571 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
404 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
174 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
3k 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
53 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
129 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
105 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
43 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
124 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
70 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
92 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
46 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
36 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
50 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
1k 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
823 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
720 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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