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Take a 2000-04 Toyota Echo and put another overdrive gear in the transmission, to get the engine RPM down to 2k (or less depending on aero) at 60 MPH from the normal 2500. Do a little aero work and DI with higher compression.
Start stop to eliminate unnecessary idling.
I had no problem averaging high 40s in mine, best was 57 using EOC while averaging better than 40 mph tank to tank.
Cheap and easy to do, but then what happens to the Prius sales?
The original Echo 2 dr was about 2100 pounds.
regards
Mech
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