Ahh but I'm also interested in the needlessly fast. Simply getting rid of the surface area, drag, and mass associated with a 4-wheel car would be enough of an economy boost for me.
If it was to be a commuter car, I would probably choose a 660cc Kei class car as a base. With a respectable 47kw and peak torque around 3-4000rpm (redline around 8000) it would be a driveable, economic unit.
But seeing as I want to go needlessly fast too. Maybe a 1.3-1.5 turbo motor would be a good mix of both (say a Yaris RS turbo).
Also, for simplicity I would use the ENTIRE front end of the car. This makes it heavier though, but all the components are guaranteed to fit, over-rated for their new use, and anything you bend is easily sourced at a junkyard (if you bend the back end, well, **** happens). It also means that the complicated end of the car is already built.
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