If you add up my individual tanks, my lifetime consumption should be 50.1 gallons. My spreadsheet says 50.169, but I was only working with the one decimal digit tanks from the database. The database itself might have higher internal precision. But in any case, 50.1 is close enough.

On the other hand, the Gal Gas field in the master car entry says 49.8 gallons. That's like .7% off. According to my spreadsheet, I'm supposed to be 58.4 lifetime MPG but the database says 58.8. Interestingly enough, that's also .7% off...

Andy