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As part of our recurring series, the next Chat with the Expert is on how to publish a book with SAE International. This is the discussion thread where you'll engage in this online conversation with our expert, @Sherry Nigam , Head of SAE Books. In the meantime, if you'd like to submit a question ...

3 tank average smooths out all the errors and will discover problems before they are problems. Plus it is interesting to see seasonal variation and a boost on long trips. Gary Derian

I did that myself in the mid to late 1970’s too. A lot of guess work too, how full was full? Rounding of miles driven? I think the MPG given in todays cars are just as accurate. Bob Sent from my iPhone

I do that and have a record of every fuel purchase since 1974. But I switched to spreadsheets in 1986 or so. Gary Derian

Yep. Good Luck with your project Cheers, Bob ------------------------------ Bob Gruszczynski Retired OBD Communication Expert ------------------------------

I remember my dad (and his dad) in the 70s kept a detailed log in the glove box of every fuel purchase, miles driven, and mpg. Doing the math by hand, of course.