I'd be curious to know how you're getting that kind of mileage. I basically have the same configured truck. Thus far, the best I have gotten is a little more than 21 mpg. I've made 2 round trips between DFW and Austin (200 miles one way; 400 round trip) in the last month. My speed was averaging between 70-75 mph on IH-35 which is the speed limit depending upon wherever you're driving. Bought truck new but it now has about 2,300 on the ODO.

Not sure if it is a gas quality issue or not. I've bought gas from Sam's Club and QT. Maybe I need buy a better grade of gas from Exxon/Mobil, Valero, Shell or something like that. If you're doing something else, I'd like to know what it is. Any feedback is appreciated.

 

Well I have been keeping an eye on my mpg. Seems if I buy Exxon or Sunoco I get close to 21 but if I buy the cheaper Costco or Wawa gas it goes down to about 18.7

 

I was going to make a new thread but this is pretty related. I've got a 2015 3.5EB...I've been getting about 19mpg for mixed driving average. At some point I plan on getting larger tires for the stock 20's (275/55/20). Assuming I go up to a 33-34" tire (275/60-65/20)...What mpg should I plan on losing?

 

2016 2.7 Eco, fuel mileage is much better at 60-65mph than 70-75mph.

 

I've done 1200 miles with my 2016 157" wb 2.7EB SuperCrew (3.31 gear) since late January. The first two tanks came in at 21.5 on the lie-o-meter, with the current tank showing 20.9.
87 octane.

 

Okay, I generally get the idea that paying a little more for better quality gas AND slightly lower highway speeds will apparently help improve mpg's. What about higher octane gas [Premium vs. Regular]? Does that help overall mpg's? For example, would Shell's V-tech premium gas work a little better in a 2.7 EB engine than regular? AND, does higher octane gas have any drawbacks or will it potentially create maintenance issue with my engine?

Finally, does anyone occasionally use Lucas Oil Injector Cleaner or Marvel Mystery oil additives to their gas to help bump up mpg's? Any pro or con issues?

I am STILL mystified how the other guy from Texas around the San Antonio area got the mpg's he posted not too long ago! I made the round trip drive (300 miles one way) between Dallas and San Antonio and did not come close to the mpg's he says he got!

My regrets if any of these questions have been asked before. Thanks for your patience and any feedback about any of this.

 

I filled up at Shell the other day and was talking to the owner. He said right now Shell is A ++. Exxon A+ and BP A. Just about every other brand is tier 2 gas ex: Costco,Gulf etc. When I got back in truck my MTE was 488 which was highest as of yet. Must be some truth to it since I started using better quakity gas I have been getting 21-22 mpg

 

It's a funny thing that when we had a major gasoline pipeline leak a few months ago they said that it affected all the distributors in this part of the country.

 

As an update, I switched to non-LRR Goodyear Wrangler All-Terrain Adventure tires because I had frequent flats with the OEMs. Mileage in my 3.7L 2012 RCSB dropped from about 20-21 to 18.5-19.5 (at least during the colder months, up to 20 in the summer). I do a lot of highway driving at 70+ mph.

 

Looking to buy a screw 2017 with the 3.5 eb and 3.55 rear end. What are the real world numbers at 75 mph? 4wd and hankook 20 inch.