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This is just great for that speed. For example: My 1997 BMW 523i E39 (2,5 r6 petrol engine with 170 hp, runs with E10) did about the same mpg at this speed - only changing the 3.15 rear axle to a 2.64 axle. Considering, itīs a fuel injected, relatively modern engine, this isnīt pretty low, compared to your chevelle.
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