-Most say that doing an EGR
delete gained them a MPG
or two. I have yet to try it so I can't say one way or the other.
-Easy on the throttle obviously.
-If you have a boost gauge, many recommend trying to keep your boost in single digits and below 5 PSI
for max mileage.
-Some tuners offer mileage settings, but again YMMV. I have read of folks who used the mileage setting and then the base level for performance and got better mileage on the performance setting.
-Keep tires inflated to proper settings. With stock that would be what the sticker in the door jamb says, but with those I would say ask what the pros would run them at.
-Anything to make the engine run more efficient...so making sure fuel and air filters are clean and in good condition, as well as ensuring you have ample fuel pressure would help. And I would also bet that if you have obstructed flow through your CAC
(lots of dead bugs, a winter block off, etc) would impact the final charge temp. From what I understand, cooler temps equal better efficiency/power. To go along with this, most of these engines' CCV
systems wind up putting oil throughout the CAC
pipes. I'd be willing to bet that an aluminum CAC
coated with oil on the inside does not cool down the air charge as well as a clean CAC
-Reduce your drag. You lifted it and so hopefully understood that lifting was going to have some negative effect on mileage. But, you can help get some of that back by lining the bottom of your truck in some way. If you can reduce the turbulence under the truck you will increase mileage.
If it's a pickup and not an Ex, my personal experience, and from what I have read it's many others' experiences as well, leaving the tailgate up is actually better than putting it down...and of course having a bed cover helps as well.
All out of ideas. Hope one of em works for you!