I too track everything (fuel, parts, service and mileage) in a multi-page Excel spreadsheet, plus try to keep all receipts in a separate folder for each car.

I do not track washing and waxing, but I do run a line graph of my fuel mileage.

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Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon TDI...at least its a diesel

Non illegitemae carborundum.