Decades

No increase in MPG, if anything a slight decrease, 11-12 MPG on my commute, around 13 on the highway. I try not to commute with it anymore, but it gets about the same when hauling stuff locally.

These were the higher set of numbers from Abacus Racing. Before 251hp/306ftlbs, after 389/362, at the wheel. There is another before/after from Virginia Speed that was 248/302 before, 342/328 after. Those were peak numbers, keep in mind the area under the curves when looking at before and after- with the before curves at Abacus, there was some jumpy data readings that threw off the peak numbers but overall they matched what Stillen claims on their graph on their website. I still have not put an intake on it, just a k&n filter. It does have headers, b-pipes, and exhaust.

LT 285/75R17 Nitto Terra Grapplers

No, no I did not.  My mileage has been as high as almost 13mpg with AC off and mostly highway driving at ~65 mph to as bad as 10.8 while driving with lots of stop and go and accelerating quickly, so at least it is consistent.  I've yet to try it in "Valet mode" but that may help.

     My long distance driving is probably more influenced by hills and the Appalachian mountains and a fully loaded vehicle (7 passengers, vacation luggage, and pets.)  My local miles are mostly with an empty vehicle in a very flat location. 

     I have not made the same long-distance drive from where I picked it up from Quigley to Hampton Roads and got around 16mpg with an empty van, so I do not have an apples-to-apples comparison.

     The gas mileage does seem about the same in the city as when I just had the Quigley conversion, lift kit, and larger tires, though- the last 9k miles have been pretty consistent.

They are the 285's.  There is about about an inch of space between the tire and the door, and the front struts are close, too.