Your T56 must have the .50 6th. Mine is .62 with the .80 5th so I'm at somewhere around 2200 at 70 I think but I don't remember.
When I tested my fuel millage back when we had the fuel millage thread for boosted cars I was shifting at 2000rpms for each gear change. Surprisingly my Cobra has quite a bit of torque below 2000. When I cruise on city streets where the speed limit is 40-45 I'm usually in 5th gear turning around 1400rpms. My car idles at 1000.
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