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Answered 2015-07-17 17:31:55

That has been my understanding as well and it seems logical as gas is very heavy. Keep in mind, however, that to let the fuel go too low in the tank can stir up rust particles & tiny debris at the bottom of the tank. This could jam up the fuel filter.

On the other hand, there is this theory that keeping gas tank filled reduces wastage of fuel through evaporation (the empty space in tank would allow more fuel to evaporate). So, which is method is more fuel saving?

Best way to answer that question is to test the mileage numbers per gallon.

Fill the car only half way for a few months and keep track of the mileage per gallon by filling it up totally at the end of each month.

Then keep the tank full each week and check the mileage again.

I did that with a 86 Buick V-8 and the mileage went from 15>14.

I decided that having a full tank was worth the loss for various reasons. The least of which is the hassle and time spent refueling.



Thanks for info. Yeah, sometimes it may just not be worth the effort just to gain one or two miles more. But, I will test to see how much extra mileage I will get.

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