I tip 20% if good, and less if poor.

I used to work in a restaurant, so I know how it is. If a waiter's late with something and I can tell it isn't their fault, I don't skimp on the tip. The tip's really based on the quality of the service (how hard they tried) and less about the food.

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Current:
2014 VW Tiguan SEL 4Motion 43,000 miles.

2016 Hyundai Santa Fe Sport (wife's).

Past:
2006 Jetta TDI 135,970 miles. Sold Nov. '13.
1995 E-320 Special Edition. 220,200 miles. Sold Sept. '07.
1987 190-E 16 valve. 153,000 miles. Sold Feb. '06.
1980 300-D 225,000 miles. Donated to the National Kidney Foundation.
1980 240-D manual, 297,500 miles. Totaled by inattentive driver.