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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Interesting truck. I'm not really up on Big Blocks in trucks, but I would say that 7 MPG would be reasonable, especially if you give it a good Super Tune. I like the words "driven right". That can make a big difference in MPG. Keep up the revs in all gears, but also be light on the gas. Split shifting the Rear will also help, especially pulling loads up hill.
Keep us posted.