http://ecomodder.com/forum/showthrea...mpg-33961.html
If you need some v8 inspiration, take a look above.
Also the 93 2wd 350 v8 Suburban i once had would return around 21mpg driving reasonably on the highway.
Another thing, if you can restore your rig to epa that’s a pretty huge jump by 15%, small MPG increases on these rigs are actually big gains.
Good Luck