I thought I was the only one that did this, my numbers for my 2000 v8 are:
9670 miles
511.8379 gallons
$1452.65 spent with an average mileage of 18.89 (3000 of these miles were the trip from California to ny to bring it home so my mileage is higher than it will be). 15 cents a mile for gas, 19 cents a mile for purchase and 29 cents for maintenance (lots wrong with it when I bought it which explains the 1800 price tag)
I thought I was alone too! LOL I always get a roll of the eyes from my fiance when I am writing my mileage down on the receipts and usually told that I have a problem and should seek mental help. HAHAHA. Oh well. It's cool. I just like to keep track. I have done this with all of my vehicles I have ever had.