ordering 2011 6.7
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Mountain Pass
Joined: Oct 2003
Posts: 169
Likes: 14
From: western new york
ordering 2011 6.7
hi I have a 2008 6.4 3.73 gears what should i be looking at for the best milage in the new one the most i tow is a 10,000 lb. dump trailer and a 11,000 lb fifth wheel I need the best fuel mileage possible 3.31 3.55 373 4.30 2011 250 supercab 6.7 4x4 lariat also what is the 67H HD suspension package the dealer told me i had to have for the locker gears
Senior User
Joined: Apr 2010
Posts: 303
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From: SE Wisconsin
hi I have a 2008 6.4 3.73 gears what should i be looking at for the best milage in the new one the most i tow is a 10,000 lb. dump trailer and a 11,000 lb fifth wheel I need the best fuel mileage possible 3.31 3.55 373 4.30 2011 250 supercab 6.7 4x4 lariat also what is the 67H HD suspension package the dealer told me i had to have for the locker gears
Your mileage may vary.
Lead Driver
Joined: Jan 2010
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I have maxed out at 16.2 MPG without towing and 900 miles.
My TAC has never been above 2700 RPM and max of 15 psi of boost and that's more than enough power. I've had payload but I didn't notice any MPG changes although even 500 lbs allows the truck to ride great.
It will be awhile before I tow a utility tractor so I don't yet know those numbers.
My TAC has never been above 2700 RPM and max of 15 psi of boost and that's more than enough power. I've had payload but I didn't notice any MPG changes although even 500 lbs allows the truck to ride great.
It will be awhile before I tow a utility tractor so I don't yet know those numbers.
Elder User
Joined: Apr 2010
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I drove both a 3.31 and 3.55 geared truck. I noticed a diffrence just in normal driving and from what ive read from a few people. the 3.31 and 3.55 get very little fuel economy diffrence. Thats why i have a 3.55 truck. Might be like 0.4-0.5mpg diffrence if that.
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Mountain Pass
Joined: Oct 2003
Posts: 169
Likes: 14
From: western new york
I really do not know what the gear differance means I had a 03 that had 4.10 gears and the gears made the truck scream and no gas milage the 3.73 on my 08 lots of power no fuel mileage I guess thats why im confused witch gears will produce lower rpm more fuel mileage is it 3 revoutions pinion to 31 revs of star gear so the 3.31 should get better fuel mileage or is this backards and the 3.73 is better
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Mountain Pass
Joined: Oct 2003
Posts: 169
Likes: 14
From: western new york
ok radzer it's 3.55 to 1 and 3.31 to 1 in your opinion i should go with the 3.55 for more power and not much difference in fuel mileage
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Mountain Pass
Joined: Oct 2003
Posts: 169
Likes: 14
From: western new york
got agressive today and set out to get the best trade since im on the z plan for retired employes its who gives me the most money. So far between 31,000and 34,000 the best my 2008 has 17,000 miles on it and nada showes 33,770 so 34,000 is the winner i'll find out tomorrow if the deal is still good I went with 2011 6.7 lariat ,SC, 4x4 ,3.55 locker gears ,camper pkg,man step,remote start ,chrome cab step,all weather mats,275/70/18/all ter,ingot silver strlng grey ac,$46,634 plan. Just tired of between 8 and 11 mpg
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