Community Forums

Rob_M · 11-25-2022, 10:29 AM

Quote:

Originally Posted by trispeed

all tires have a speed rating, it's on the sidewall. L is 75 mph, M is 81, N is 87. 16" class C tires are usually 106 mph rated.

Yep. My 22.5” Michelin’s are M speed rated. Several have argued with me online about this, but can’t argue with what is molded into the sidewall.

ArtJoyce · 11-25-2022, 01:49 PM

My sweet spot is between 63 and 65. I have mixed feeling about traveling below 60 mph. On flats I don't get into my top gear (6th) until about 53 mph. Below 60 any slight grade has me dropping a gear.

Going over 65 mph up to 70 mph I take a hit of about 1.2% per mph over 65. Over 70 I don't have enough experience except on down hills building up speed. But if I stay in my sweet spot I get 10 to 10.2 mpg

Neptune66 · 11-25-2022, 02:29 PM

Interesting discussion about fuel economy, but I see no wisdom expressed here about the speed ratings on the DP tires as a consideration------ typically 75mph, but even that is variable under the amount of loading....thoughts

Unplanned Tourist · 11-25-2022, 04:29 PM

Quote:

Originally Posted by Neptune66

Interesting discussion about fuel economy, but I see no wisdom expressed here about the speed ratings on the DP tires as a consideration------ typically 75mph, but even that is variable under the amount of loading....thoughts

Read trispeed's post........

Flyer15015 · 11-25-2022, 05:11 PM

If you have ever seen in person, a big class "A" that has been rolled, that will slow you down!
I have, and it did.
62 is plenty fast. in the best of conditions.
In my case, gas milage is the least of my concerns.

Mike in Colorado

NMRVer · 11-25-2022, 05:20 PM

in the southwest, interstate speeds are 75 MPH or more (Texas). I used to drive my Challenger at highway speeds all the time. I now drive 65 and don't feel like I'm blocking traffic. I guess with age comes wisdom. And better fuel economy.