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I'll also throw the hat in for a Mk4 VW diesel, either a Golf or a Jetta. Not sure what specifically you consider a "modification to the body of the car", but with a grill block and some under-body aero treatments and a few other non-body mods, I average about 60mpg at 65mph (several occasions where I got 60+mpg tanks on cross-country trips).
Plus I can run 100% bio in mine too (currently run a 20% blend since that's easily available).
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