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Discussion Starter · #1 ·
Im buying a 2001 ctd dually has 4 10`s it is a 5 speed and he says it gets 17 mpg. My father in law says no way he gets that much could you explain why he does or does not get that
 

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It's totally possible, I've got an Auto dually with 4:10's. The best I've gotten is 17.5 MGP driving under 60mph on the hwy.
 

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Check out the truck in my signature. 4.10's, never drops BELOW 17 even when I'm towing. Normally huvers around 19 just daily driving. It's totally possible. Your father in-law must not be a diesel guy.
 

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With 33 to 35" tires, it is very possible. With stock tires, it will be from 14-16 mpg. So, definitely check the tire size. If he's got 285's or 315's on it, then he's probably right on with that mileage.
:popcorn:
 

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a 4:10 will run 70mph ABOVE 2000rpms where MY 3:73 will run 80 at 2000rpms. The 4:10 is for heavy towing, or racing, or wherever more RPM's are needed.
 

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Discussion Starter · #8 ·
thanks this is good to hear My father in law has a 1999 3/4 ton with edge box, he has 355 rear end and gets 18 empty and 13 pulling so he is just not happy that i will get better mileage.
 
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