Originally Posted by
Fleet 500
Wait a minute... alllow me to make a correction. There are some cars that get better mileage at 50 mph than at 30 or 40 mph. Like the Pontiac I posted before:
'68 Pontiac Catalina (400-cu-in engine, 290 hp, 2.29:1 axle ratio, 4,133 lbs curb weight)
MPG @ steady:
30 mph------------ 19.5
40 mph------------ 21.5
50 mph------------ 22.0
60 mph------------ 19.0
70 mph------------ 17.5
and of course you have no idea why that it? Because at 30-40 the autobox is constantly thinking what gear to be in...while at 50 the engine delivers enough torque to make the gear box think it can stay in top.
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