Motor Vehicle Maintenance and Repair Stack Exchange
Motor Vehicle Maintenance and Repair Stack Exchange

Questions tagged [fuel-consumption]

Use for questions related to fuel economy.

Fuel efficiency measures how far you travel on a given amount of fuel. It is typically measured in Miles per Gallon (mpg) or Kilometres per Litre (km/l)

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Are there any advantages of idling a vehicle vs. turning it off and back on again?

I was sitting outside, eating my lunch the other day, and a small bus (you know, one of the short ones) pulled up to the sandwich shop I was eating at. I noticed that the driver got out of the bus, ordered her food and waited for the roughly 10…
James Mertz
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What can cause a car to consume more fuel?

All over my long driver career, I had 4 cars (5 years). I always compare my fuel consumption with other people who have the same car. 3 times out of 4, I found out that my cars were consuming more fuel then others (I like buying car in poor…
Jean-François Savard
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Gas mileage down significantly the last few tanks: what should I look for?

The gas mileage in my car is degraded significantly the last three tanks. What should I look for? Details of the vehicle are below, but this question could also apply to anyone who sees this problem with their car. It's a 2005 Chevy Aveo, about…
Joel Coehoorn
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Why vehicles use fuel and how can fuel economy be improved?

Why vehicles use fuel? Where does the energy in the fuel go? Vehicle fuel efficiency is continuously increasing. Why is this the case? What technologies car manufacturers are using to improve fuel efficiency? If somebody claims to have a solution to…
juhist
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How does a real-time mpg display work?

Among other things, I'm a computer science instructor. I'm considering a programming exercise to simulate the dashboard mpg display found on many modern cars. It seems easy enough: monitor the fuel line and the odometer data, and at periodic…
Rick
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Can I save money using E85 in my flexible fuel vehicle?

Where E85 Ethanol is available (not very common), the price per gallon is often lower than regular unleaded gasoline. Though I've read that fuel economy is commonly reduced by 20% or more, when using E85 Ethanol. I'm driving a flexible fuel vehicle;…
Tester101
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For 2 identical car models, 1 being cabriolet, which consumes less fuel?

What is the effect on car fuel consumption of having a roof or not? I guess it may depend on the car model, but generally, considering common commercial cars, which setting saves more fuel?
caub
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Unusual fuel consumption

So I haven’t been driving for a very long time only about a year or so, and my car is an Eagle vision Esi 1994. I just replaced my inner and outer tie rods and put oil into the car, I haven’t had any work with rebalancing or rotating tires(which is…
Kalyn Ebinger
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Fuel consumption jumped by 40% overnight

I have a 2012 Diesel (1.6 112 HP) Ford C Max. Last Monday, I noticed that fuel consumption jumped by 40% ! In the beginning, I was blaming some cold weather that day. But then, the temperature returned to the normal (16-18°) and the consumption is…
Bill
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Effect of loss of fuel tank vapours on mileage

Are there any estimates available on how much fuel you can expect to lose from a fuel tank that is leaking vapours? Leaking vapours would be caused by cracked/missing evaporative emissions hoses, a leaky/missing fuel cap, et cetera. I realise that…
kahbou
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Fuel efficiency and volumetric efficiency

I was reading about the better volumetric efficiency of DOHC engines as compared to SOHC engine and was wondering if fuel efficiency is directly related to volumetric efficiency.
Robert S. Barnes
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Are L/100km figures reported by the Canadian government attainable?

I'm in the market for a new car, and fuel efficiency is important since I'm commuting 2 hours a day. The EPA and Canadian governments use different measures of fuel efficiency. I don't mean just the US/Imperial gallon thing. If I convert those, I…
Almo
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What driving speed gives the best fuel economy?

If you are running low on fuel in a gasoline powered car I guess driving at a constant speed is best and turning off stuff like the AC would be wise . I suppose keeping the car in a reasonably high gear would be good too? The question is what is…
Autistic
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How to calculate fuel consumption?

If i know the rpm at which the (tachometer indicated) engine is running and the current speed and the engine capacity is there a where to calculate the fuel consumption of the engine? Need not be a precise one also. It can be simple thumb rule also.…
Sujeesh John
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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 example: a CarShare's Kia Soul yielded 4-6 L/100 km,…
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