New tires: General Grabber HTS
 

I bought these General Grabber HTS tires in late September to replace the Toyo A/T Open Country tires I had on my Silverado before. Exact same size tires, just the different brand. They are heavier, but marketed as low rolling resistance and rated for higher psi and the tread pattern is a highway tread.

So far, I'm not impressed. No A-B-A data, but comparing to my mileage from the same time last year, I'm averaging about 5-10% less than my old tires. I've only got a couple tanks with them so far, so I'll keep trying, but it looks like they weren't the right choice.

Anyone else with these?

You know new tires have more r.r. than old tires and it takes about 4000 miles to "bed in".

If you are getting the same MPG with brand new tires Vs. the old worn out tires that is a good sign.

You are going farther with your new tires, than your worn old tires.

I actually hadn't heard of that before, and didn't pay close enough attention to my mileage the last time I got new tires.

Tread depth on the new tires is 12/32". Worn is at 5/32", for a difference in radius of 7/32".

Calculated diameter new: 31.6"
Calculated diameter old: 31.2"

That's a difference of a little over 1%, while that could account for some of it, it's not the only reason.

Tire Tech Information - Tire Rolling Resistance Part 3: Changes to Expect When Switching from Worn-Out to New Tires

The part about the 4000 is in Tire Rack Tech somewhere too.

Well, now that I have a few miles on them my fuel economy seems to be getting a little better. After getting gas this morning, my Ultra-Gauge reported 23.7mpg for the highway leg of my commute (22miles on odometer).

http://ecomodder.com/forum/member-da...g-22-miles.jpg

Still not where it was, but it's improving.