I anticipated a May or June build and and therefore a delivery in June or July. I didn't want to wait that long and opted for the 3.5 with the 502A. I am very pleased with the truck and love the performance, but the mileage is only 16.5 overall with just over 1000 miles on the clock. about half road and half town miles. I think the 2.7 with 3.55 would suit my driving just fine. The truck rides like a luxury vehicle and I would buy again. Gas mileage at current prices does not bother me, but when fuel costs rise again, I'm sure I will miss the gas sipping 2.7. The features of the 502A in my opinion take the truck to the next level of luxury and I am pleased with that option package.