FlatbedHemi
Senior Member
I regeared my truck to 4:56's about a year ago. I cruise the highway at 2,000 RPM's at 70 mph. I typically see 16/17 mpg on the highway and 13/14 in town (summer gas and calculated via the dash). In the winter I lose about 1mpg. Towing my trailer, I see 7/8 mpg depending on load and headwinds. I don't exceed 65mph with the RV trailer. I do drive like a gentleman. One thing to note as well, my MDS does not come on anymore then it did before. MDS is pretty much un-useful and only activates when my truck is slowing down.The biggest thing to consider is when using tow/haul mode with a geared truck, the computer locks out 6th gear. In tow/haul mode at 65mph (5th gear), I'm turning 2500 RPM's which is just right for my RV towing needs. I really don't want to go any faster with my RV trailer. But when I'm towing the flatbed with a car on it, I can't use tow/haul because I like to go faster and it will push the rev's further than I like. Something else to think about.
Now that I have over 15,000 miles on my 4:56's, I have no regrets and would not go any lower. Below is a quote from my initial post regarding my gear swap.
View attachment 171738
Are you still running stock size tires to get those numbers?