I wish I could get close to the MPG you guys are getting. I drive around like a grandpa and can't break 24 MPG for an entire tank. I have gotten 500 miles on a tank just two or three times in 3 years of ownership. If you're getting 26-28 MPG you should easily be getting over 500 miles per tank. Are you actually getting this, or are you just reading the computer MPG's? Usually my tanks are in the 400-450 mile range and MPG is in the 21 mpg range (hand calculated). My interstate speeds are 65-73 usually. I know going faster hurts a lot, so I try to keep it at 65 when I'm not running late. I just don't think it's possible for my jeep to get over 25 for a whole tank unless I could drive 50 miles/hour the whole way, and that's not gonna happen. Hopefully the GDE tune will do some magic for me.
My mileage is nothing to shout about compared to some others who post here. I would like to see a careful study done that compares exact equipment with mileage.
For example, I have ECO Tune, but I also have a bunch of 4xG armor that adds weight and I still have my roof rack in place. I have QDII..... how does that effect mileage compared to QTII? Etc Etc. Adding the tune gave me a nice increase in mileage...but since I was only getting 18-19 around town and 21-23 on the highway before the tune.... it is still below what some claim after my 2.5 mpg increase.
2007 WK 3.0L CRD, Quadradrive II, GDE EcoTune, DPF-Delete
4xGuard Front, Rear, Belly, & Side Rails, Factory Skids
EHM MOD, Garmin Mechanic EcoHD, K&N Filter (Deleted)