My Gas Mileage - Gained 2 mpg - Nothing Has Been Changed

[diyer2]

My last trip to our mountain place to go fishing resulted in a 2 mpg increase in mileage. No changes to the truck, filled up at Costco like always. Same roads and routine, towed boat to lake.

This truck was getting 13.7 mpg average city and mountain driving up till this trip. Took a trip to the store today and checked the DIC and it says 15.8 mpg average now.

Not complaining but doesn't make sense. I have taken 4 fishing trips and normal city driving previous to this trip.

I noticed when I got home the fuel gauge wasn't as low as before.

Got me scratching my head.

Removed my hat first though.

 

[Wes Merritt]

Summer blend gas perhaps. Although 2mpg seems a bit high for that to account for it.

[DaveH71]

Refineries have switched over to summer blend gas, i usually go up about 1.5 - 2 mpg, starting in june every year.

[scott19677]

My truck really picked up in performance this summer when better blend of gas came in. I got my Blackbear tune last October and ran E85 for a few tanks till winter then started running 93 but a month or two ago I could really tell a difference. I can't comment about better mpg because Im having a hard time keeping my foot off the go pedal.

[j-ten-ner]

Your engine starts burning oil...

 

so long

j-ten-ner

[diyer2]

Burning oil increases mpg?

[bgbdwlf2500]

I have always noticed a change in mpg from winter to summer fuel, that would be my guess also

[swathdiver]

Maybe Costco bought that latest fuel from somewhere else?  Yes, I know this thread is old.  

[Grumpy Bear]

On ‎6‎/‎14‎/‎2016 at 6:33 PM, bgbdwlf2500 said:

I have always noticed a change in mpg from winter to summer fuel, that would be my guess also

Yikes!!