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If you were to gear the Impala taller (adding a gear vendors would get you to a 0.55 double OD), and maybe slightly taller rear axle gears too, it would probably get a lot closer to the truck in mpg. City mileage would still be worse, due to worse thermal efficiency at light load. However, if you can get the gasser loaded heavily enough on the highway, it will be almost as efficient as a diesel in a similar vehicle.
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Call me crazy, but I actually try for mpg with this Jeep:
Typical driving: Back in Rochester for school, driving is 60 - 70% city
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