Would you choose a V6 TT with, say 50 less HP, but 5 more MPG and cheaper sticker price?
See that is a very tricky question to be asking. To gain 50hp in a twin turbo setup is incredibly cheap and easy. Hell, you could get that with a mild tune and a new intake. Throw some new exhaust on it and you could be closer to the 75-100hp area with very little invested.
It would depend on how much cheaper the sticker price is. If it was a lot, say $5k, I could probably spend a lot less than that getting that missed 50hp and I would probably still come out a little ahead on the mpg.
If Id have to spend more on upgrades to get those lost 50hp I most likely would opt for the v8 over the ttv6.
Id honestly be torn between the two. On one hand you get the instant tq of the v8 and the proper exhaust note to go with it. You also get less parts on the v8 which is always a plus. On the other hand you can mildly upgrade a tt to get the lost power and you get better gas mileage which means more money for added toys. Im used to rigs that get 9-13 mpg so gas mileage isnt a huge concern but if you get to save a little at the pump thats never a bad thing.
If the v8 had 75-100 more HP over the ttv6, less mpg, and a slightly higher sticker price (less than say $3,500) Id go with the v8 with no hesitation.
If I only gain 50hp, less mpg, and a higher sticker price Id most likely try my luck with the ttv6.
If you dont care to mod your truck and want to stay 100% stock, go with the v8 because more power. If you dont mind throwing a couple mods on and like the idea of "newer tech" go with the ttv6.
Its a hard choice and to be honest I dont think either way is wrong.