I am kind of surprised that nobody else is encouraging the MPGuino. If you open the "65+ Efficiency Mods" page, it is the very first suggestion!
Doesn't everyone talk about "Adjusting the nut behind the wheel?"
I know that the MPGuino is very different than my Ultragauge, but I rely on that to tell me when to fill up, not the fuel gauge, since it is far more accurate.
At least with the MPGuino, you can do A-B-A testing and see if there is a difference without filling up, which would not necessarily fill to the same level every time.
If you do rely on topping off to see how much fuel you used, they always say to use the same pump at the same station.
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