About 55mph.

at what speed would you get the best gas mileage on the freeway, keeping rates of acceleration and hills, and all of the other options the same? 65, 75, or 85? at 65, you will be covering ground slower than at 85, but you will have less rpm's, and less air drag. at 85, you will be making ground a lot quicker, but have higher rpm's and air drag.

i was wondering about mph, not k/h, sorry

80 km/h... just enough for the OD + TCC to engage.

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1992 Bonneville SE
~245,000 km

<font size=-1>[ This Message was edited by: Greg on 2002-05-01 22:11 ]</font>

My car locks up @ 46mph, but its kind of jerky when it does.

I would anywhere from 55 to 65 mph.

A constant speed of 55-65 will yield the best milage. Quick accelerating and stop and go will eat at the fuel economy.