Your car is shaped a lot like my old Festiva, Black Widow. If you're interested in wheel skirts, I'm sure my DYI is still on here.
Adding a front grill block, rear wheel skirts and a Kammback (along with changing driver habits and routes, and a lot of P&G) gained me a lot of mpg back in the day. I went from 42 mpg to the high fifties, and broke 60 mpg one tank.
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