Originally Posted By: dothedrew1202
Originally Posted By: 01_celica_gt
no practical benefit, anyone who thinks so...isnt being logical.
Also, the more weight a car has to carry, more stress on the fuel economy, extra gas = extra weight
It's an accurate way to track fuel economy, unlike gas, diesel foams a lot so the foam will trigger the nozzle to stop. It's just easier doing it this way because you don't have to worry about other variables. I also usually don't fill up before I park, I do it before my 38 mile commute home from the gas station by my work.
I really only do this to track my fuelly mileage. If it's bad I'll stop.
if you're tracking your mileage, the error due to the "full tank" will diminish if you just do your statistics over multiple fill-ups rather then one fillup. At the end of your period you'll only be off by the error of the last fillup level-first fillup level.
You know how much you put in the middle over multiple fillups.
On the other hand, topping off everytime potentially spills a little fuel into some overflow or some evap or whatever system your car may have for expansion. So this technique I feel will actually introduce more error into your mileage tracking instead of reducing your error. Plus your goal is to have high MPG, so you're losing out a bit there too (however minimal it maybe).
If the point though is for convenience, and you need that extra gallon so you can drive longer, that's a better reason.