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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: Trip Computer
> John Himes:
> When I want to
> do this kind of checking, I normally fill the tank until it starts to come
> back out & then replace the gas cap. That way I am SURE the level is the
> same.
Don't bet on it! As a result of the same EPA requirements that gave us
carbon canisters, there is a requirement that gas tanks can't be totally
filled, they ALWAYS have to maintain an air pocket above the fuel. Since the
vent system (with those hokey pressure limiting valves) operates even while
filling the car, the size of this air pocket can vary all over the place; it
can vary with how FAST you filled the tank. It can vary with the mood the
car is in that day!
The only reasonable way to evaluate fuel consumption really closely is to
figure the total consumption over many tankfuls.
-- Kirbert | If anything is to be accomplished,
| some rules must be broken.
| - Palm's Postulate
References:
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