[GCncsuHD]

Originally Posted by PAWS 72

yea could we?I may be getting one .I think.

Originally Posted by C-10 simplex

i'm thinking of getting one also. That's why i want to talk mpg.

Well then, in all seriousness, the way the truck is setup, the load you are hauling, the way you drive makes huge differences.

As mine sits, unloaded, a K30 with a SM465 (no overdrive) 4.11 gears, and 35" tall tires, 350 v8 and original carb I get roughly 12mpg, that is all wide open country driving probably 95% highway 5% city, and babying the throttle. Recently I made a 200mi round trip 70mph on the interstate with an empty trailer there, and then a 69 K5 Blazer and a bed full of parts on the trip home, I averaged 10.5 that day. A couple weeks ago I made another trip, about 100mi round trip to pick up a 71 C10, about 75% highway 25% city, I got right at 9mpg that trip.

I have had bad tanks too, 8mpg or so when I have used it around the farm a lot.

These numbers are all hand calculated, fill the tank to full, mark down the mileage on the odo. I do apply a 15% correction factor due to my taller 35" tires vs the tiny 30" tall stock tires that the odometer was calibrated to.

Also I noticed my mileage bump up about 1mpg when I went to the 35"s due to my highway driving and keeping the rpms down on the highway. If you did a lot of city driving, I'm sure you would have the exact opposite results.

I would guess a big block truck would be 2-3mpg less unloaded, and maybe just 1mpg or so less loaded.