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Old 12-28-2015, 05:22 PM   #8 (permalink)
darcane
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First gen CTS came with an optional 6-spd behind the V6. A competent driver should be able to hit 30mpg without much trouble.

If you are set on an engine swap in an older car, most classics have terrible aero. Look into Land Speed Racing cars for tips on improving them.
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