chill
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So this may not look awesome but consider this... Lifted 2 3/4. Larger tires, HD OME suspension, bike rack. 117,000 Miles.
I was previously only able to get about 17ish per gallon in an hour trip to Baltimore from where I am. For the past week I have been consistently in the low to mid 20's hwy. and 17 city type driving.
Here is what I have changed. I don't believe it's any one thing but a mix of all that helps. I have removed the AEM Brute Force intake I had and re-installed the factory air box. From what i heard it was very well engineered to get every last bit of performance out of it. I have had hypertech's Max Energy program installed since the winter. I am using synthetic oils in everything and am religious about tire pressure. I have added a fresh air intake from the front headlight area to an opening I made in the factory "snorkel" intake. I have added simple engine restore to the oil most recently this is where I saw the main uptick in MPG's...
So take from this what you like. This has been my experience so far.