|
Re: Calculating Mpg.
Quote:
Originally Posted by LostMy65
My truck has a rather low mile 283. I don't know how it was built. So I'm also hoping to find out what rpm gets me the best mpg.
I'm thinking to find that out I would need to find the rpm that gets me the highest vacuum, correct?
|
I remember back in the 70's after the first oil embargo, you could purchase "Mileage Gauges" that were just vacuum gauges actually. I'm not sure but I think a couple of vehicles actually came with one stock (correct me if I am wrong). So maybe higher vacuum equates to better mileage to some extent. I always heard from the old guys that for an old car/truck with no overdrive, ~45 MPH was the sweet spot. "Modern" cars with OD, ~55 MPH but I guess gearing plays a big part too.
__________________
'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, 2nd owner, Work-Truck supreme. Best $300 I ever spent.
|