More 8.1 info needed ...

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12-29-2003, 10:09 AM

#31

10.5 Dave

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Quote:

Originally Posted by Jorday

I but some good break in miles on my truck before installing the juice, only like 1700 though. Seems like this engine takes a good while to fully break in because many people report fuel economy improving all the way up to 10k miles. I'm still waiting for my first 20+ mpg average for a tank, my best so far is only 18.

You won't get your best fuel mileage until at least 10,000 miles.In the winter your mileage will drop 2-3 mpg due to winter fuel being formulated for easier cold weather starting,not optimal mileage.The best I have ever got was 19.5mpg once but I have a big truck and run 75-80 mph on the freeway.I see a consistent 15-16mpg in town.

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12-29-2003, 10:13 AM

#32

Jorday

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Yah, I'm sure the truck will make 20 mph next summer with summer diesel fuel and a good 15k on the engine. It does seem to me like the 285/75 BFG MTs decreased fuel economy slightly as I expected, but some people have reported improved fuel economy with larger than stock tires.