So, the failing sensor wouldn't affect fuel consumption.

I used to get high 400 per tank. Distance to empty would always be near 500 when full. Let's see.

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2003 X5 3.0i Silver (build 07/03)
2006 X5 3.0i Blue
1977 Ferrari 308 GTB
1994 Ferrari 348TS Speciale #14/15
1989 Ferrari Testarossa