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Originally Posted by Emmerich
To iron out the differences between tanks, calculate the cumulative MPG using the cumulative mileage yu have driven and the cumulative gallons you have bought. If you do not do a full refill, the incremental (for that fillup) MPG for that refill is not accurate, but in the long run the cumulative will absorb that inconsistency. Of course if you rarely fill to the top, you canot calculate MPG reliably at all.
A simple spreadsheet works well to do these numbers. You can also create a historic graph of gas prices so you can yearn for the good old days....
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I would say it is easier to zero the mileage whenever you fill it to the rim with Brim (can't get that phrase out of mu mind although I never drink Brim.) Calculate the mpg and log that down. This long run is kinda difficult to do. I just make a note of what the mileage should be and if it is in that range, fine. If not, I try find out why if it does it again. For instance, if I am usually getting between 30-32 and I get 28, I start to wonder why. If not, I forget about it. Nothing to see here, folks. Just move on. Mental note. No paper and pencil or PDA.
Why bother with that? Do you yearn for the good old days where you were paid less too? Besides, that day is gone. nothing can bring it back.