Took the truck for a trip from NC to Upstate NY to move Mother in law. Returned with a bed either the movers wouldn't or wife wanted, some pretty heavy like a treadmill.
The truck used to get in the areas of 21 mpg Hwy / 18.8 combined. I reset the mileage system when I installed the DiabloSport last month. I am running the canned 91 tune and filling w/ 93 to compensate for gas that sometimes isn't mixed right to get and actual 91. Just in case. During cruise, tuner was showing +-14.1 AFR. Fuel is 10% ethenol. Fuel trim was bouncing between 0 and +2 most of the time.
This trip was 1249 miles in 3 days with about 200 of it running around town and lots of local stuff during the run up and down.. Filled up before leaving and made it to destination (525 miles) on 1 tank (26 gal tank) then added 20.1 gals when I got there. 525 miles on 20.1 gals not bad. Then added 15.5 gals and 10.3 gal. 46.4 gal total. Did the math and truck got 26.9 MPG combined (see pics below) and manual calculations were spot on with the cluster.
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Had MDS engaged during speeds above 55 mph, and disengaged below. Could hear the transitions thru exhaust. That 1st pic is running 57 mph on flat surface, with cruise on and MDS engaged.
2nd pic is later on, cruise set, MDS turned off and on flat road..
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I am shocked the truck used that little fuel since adding the tuner.
Once I get sensor installed for wide band, going to do some logs and get a final tune done.