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Miatas are supposed to be fun, so swap in an aluminum-block version of GM's '01-up 5.3L V8, swap in the 4.8L crank, rods, and pistons, add a '98-'02 Z28's T56, gear it to 1400 RPM at 65 MPH, add a 66-mm-or-larger turbo for the muffling, ( STS rear-turbo ) keep the boost to 5.6 psi for emissions-legality, and that should do 35 MPG with well over 300 RWHP. Then order the biggest brake kit available, then thewidest wheels that fit, choose tires with tread widths the exact same as the wheel widths ( probably wider fit on the rear ).
That'll make it a really fun car with really good MPG.
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