I keep forgetting!

The imperial gallon is larger than the US gallon. His tank held 23.8 US gallons of fuel, and he needed to average, over 800 miles, 33.6 mpg in a V8 twin-turbodiesel Audi. That was the feat.

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1987 300SDL (324000)

1986 Porsche 951 (944 Turbo) (166000)

1978 Porsche 924 (99000)

1996 Nissan Pathfinder R50 (201000)