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side taper
The aeroshell on my truck has the plan taper and is good for 13% mpg increase,over a 10%,typical of a straight-sided aeroshell.
You won't want to make the sides any 'faster' than the roof,and you may actually need to make them a bit 'slower',as the flow is slower on the sides and if mismatched you'll create attached vortices with high drag just as in a bad fastback design.
A windtunnel model would be one of the few ways to iron it all out.
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