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Would I be able to get more than 13 mpg with my 7.3 dually if I changed the 410 to 373 gears. I have done the exhaust and intake. there was a superchip plugged into the ecm under the dash when I got it.
 

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Discussion Starter #3
Those are listed. 255/85/16. Some of the single rear wheel trucks run 355 gears.
 

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high gears would likely help you unloaded mpg, but hurt your towing ability and mpg.
 

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I get about 16.5 around town empty and about 11 towing 10K. On the highway my milage is a little better as long as I keep it at 65 or below. I also have 4.10s but with the stock 235/85 tires.
 

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My cts tells me i get 13mpg , i have 4.88's. I don't get any worse when towing, until temps near 0*, then she gets worse. I stay at 60-65 most of the time, and alot of city driving, my truck weighs 14,800 lbs. and runs on 19.5's
 
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