Is filling up the fuel tank all the way to the top wasteful? - Page 2 - Renault Forums :: Independent Renault forum

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post #6 of 16 (permalink) Old 6th May 2007
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There's 3 main ways to make a car more economical, driving, streamlining and reducing weight, you can reduce the weight of your car by about 60 pounds of unnecessary fuel by only having half a tank of fuel.

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post #7 of 16 (permalink) Old 6th May 2007
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It all depends where you live/work. If you have to go out of your way 10 miles to fill up each time. The less times you have to do it the better
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post #8 of 16 (permalink) Old 9th May 2007
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I would say it is less economical to brim your fuel tank. Fuel weighs about 4lb per gallon, approx 4.5 litres to the gallon, my Lag II has a 70 litre tank, so a full tank weighs about 63lb. That is alot of weight to be pulling around with you!
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post #9 of 16 (permalink) Old 9th May 2007
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Originally Posted by pras1011 View Post
Does this cause poor fuel consumption if you fill it to the top?
In theory filling it would mean you carry more weight which might reduce your mpg by 2-3miles.....

I've covered best part of 750,000 miles in the last 10years & always fill whatever car I'm driving to the brim......

After all thats what the tanks for......
post #10 of 16 (permalink) Old 9th May 2007
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It really depends on what type of driving you intend to cover, whilst filling up.

Casting your minds back to your schooldays - you'll recall talk about inertia, momentum, etc. in essence, the more mass there is to accelerate (and decelerate as well, remember), then the greater the force which is required to change velocity.

However, if the vehicle (or object) is accelerated to a constant velocity (on a level plane), then the force which is applied to maintain that speed is equal to the friction the object is experiencing (tyre & air resistance).

Quite a long-winded way to say that on the motorway - filling to the max is best (you also save on a wasteful stop, and paying higher prices), whereas for town driving, keeping it between a 1/4 and 1/2 is probably best.

Science lesson over for today - hope you were taking notes!


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