Less than a gas engine of the same displacement, is about all I can tell you. I think it's a lot less but I'm not sure.

Either way... it just seems like less wear and tear... and for ten minutes at a time at the gas pump, it probably doesn't use half a cup of fuel.

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~Michael S.~
Past cars:

1986 300SDL
1987 300SDL
1982 240D
1982 300SD


Current:

1987 300SDL