6.0L gas RE vs mpg
Anyone guess or estimate the MPG improvement between 4:10 and 3:73 in the new gas GM trucks? How would we determine the mpg improvement switching out from a 4:10 to a 3:73 ... Got about 1100 m...
Forum Discussion
It sounds like you already know the answer to your question as you have had the 6.0 with both 3.73 and 4.10.
With only 1,100 miles the MPG's will improve over time. I expect the owner's manual even directs you NOT to tow much for atleast the first 1,000 miles of break-in if not more. I think the overall lack of miles may be more of a factor at this point than the gearing when the TC is in the back.
Nobody switches from 4.10 to 3.73, everyone wants to go the other way. Say the gain was 10% (I can't believe it would be more) and you drive 15,000 miles/yr. At 10.5 MPG and $3.50/gal your fuel cost for the year is $5,000. A 10% improvement would save you $500/yr. Switching both rears in a 4x4 can't be much less than $2,000 so the break even mark is 4 yrs, towing performance suffers, and the next person who buys your truck would likely rather have the 4.10's.
With only 1,100 miles the MPG's will improve over time. I expect the owner's manual even directs you NOT to tow much for atleast the first 1,000 miles of break-in if not more. I think the overall lack of miles may be more of a factor at this point than the gearing when the TC is in the back.
Nobody switches from 4.10 to 3.73, everyone wants to go the other way. Say the gain was 10% (I can't believe it would be more) and you drive 15,000 miles/yr. At 10.5 MPG and $3.50/gal your fuel cost for the year is $5,000. A 10% improvement would save you $500/yr. Switching both rears in a 4x4 can't be much less than $2,000 so the break even mark is 4 yrs, towing performance suffers, and the next person who buys your truck would likely rather have the 4.10's.
