Best possible mileage?

volaredon said
I don't get 85=2100 rpm... what do you mean?

I geared my Barracuda to go
85 mph =2100rpm, I'll go fix it.

AJ/FormS said
Edit one . I geared the car to go 85 mph at 2100 rpm. That was with an A833 overdrive box, ( .71od) and a GearVenders Overdrive (.78) behind that, and 3.55s out the back, so a final drive of 3.55 x.71 x.78=1.966 in double-overdrive or Second overdrive; same thing. This would be like running 2.84s with an A500 in loc-up.

At these low-rpms it is almost impossible to get the timing right with the factory timing controls. When you throw away the LB timing computer, you throw away all that timing. Assuming the dang thing still works.