Re: O/T fuel milage (towing)

Posted by Bill in NC on July 28, 2005 at 18:57:22 from (65.188.155.69):

In Reply to: O/T fuel milage (towing) posted by Nebraska Cowman on July 28, 2005 at 17:36:07:

What kind of rear end ratio does your truck have? I had a 1993
Buick Roadmaster Wagon that got 22 - 24 mpg at 65 mph, but
dropped down to 9 mpg when towing a 3500 pound boat. It
had a 2.73:1 rear end. My Yukon has something like a 3.9:1
rear end and gets 16 mpg on the road not pulling and 14 mpg
pulling the boat. The Buick would fly when not towing, but flat
let me know it didn't like pulling the boat. When the Yukon pulls
the boat, it acts like nothing is behind it. Both vehicles had/
have 350 engines. Trailer Boating Magazine tests lots of trucks
pulling heavy boats and their tests show rear end ratios
matching to engine power/torque curves is a big deal. The
other idea from Trailer Boating Magazine is reprogramming the
engine control chip for better towing performance and then later
resetting the chip for best non-towing performance.
Apparently, some truck engines get significantly better towing
performance by just reprogramming the chip.

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