I keep a set of maintenance records with 4 columns for every one of my cars: Date, mileage, work done and who did it. I'm probably gonna get rid off the last column because all the work in the past half year was done by me and the column is getting a little bit repetitive. I do calculate my fuel mileage every now and then, but I don't keep a fuel log because I see no reason behind it.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL