Quote:
Originally Posted by locomotive breath
Here is my contribution to this thread. I picked this up last week about 30 miles from home. It is a 71' GMC 6500 with a really good running 427, 5 speed, 2 speed rear, and air brakes. The previous owner passed away a few years ago and it looks like he took pretty good care of it. I plan on using it to pull my 32' GN trailer.
I still have to get the title transferred, change all the fluids, and clean it up good. I am curious as to what kinda mileage I can expect though. It has 6.50 gears on the high side and 42" tall 10.00-20s which should work out to 3400 rpm at 65 mph. I'm hoping to average 7 mpg towing approximately 16,000 lbs. Anyone think that kinda mileage is possible on long trips if driven right?
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I know you have driven yours now and have probably answered this, but my Bro inlaw works at a lumber mill and they have a couple newer 60's with the 427 5x2 combo and huge plywood boxes on them ( like 8' tall think driving a WALL) and he said they used to figure about 6-7 mpg loaded ( firewood or lumber)