I want to underclock my engine.

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Colt45

Lifer
Apr 18, 2001
19,720
1
0
buy a late 80's baby mercedes.. 190D

They came with the 2.5L 5cyl. diesel, there was a turbo version too. I think it was 35/40MPG, and its still a sort of fullsize car.
Plus the 5cyl diesels will run on anything, they're tough as nails.

Or if you have more cash buy a newer TDI VW I guess. they do into the 50's, iirc.

The VW Lupo (which doesnt exist this side of the ocean) does ~80MPG++ from what i remember. tiny though.