Forum Discussion

jffnkrn's avatar
jffnkrn
Explorer
Jun 19, 2022

GM 6.6 & 3:73

Looking for actual input, experience not opinions without experience.
Anyone that has a GM, 6.6 gas with 373 gears, towing I would like to know your experience with towing power, fuel mileage and overall performance.
Again, looking for actual information and maybe a comparison to what you had before. thanks in advance. Jeff

12 Replies

Show More
  • routeforty's avatar
    routeforty
    Explorer
    Jun 19, 2022
    My 05 duramax ,3:73,towing a 28’ TT about 6000lbs, mostly from Ohio to eastern shore of Maryland via Interstate 68 averaged about 12mpg. But I don’t get in any hurry going anywhere(speed limit or less)
  • Michelle_S's avatar
    Michelle_S
    Explorer III
    Jun 19, 2022
    Before I can answer, are your talking 6.6 Gas or 6.6 Duramax Diesel????????
    Will make a huge difference in the answers you get.

About RV Tips & Tricks

Looking for advice before your next adventure? Look no further.25,145 PostsLatest Activity: Jul 03, 2025