I'm a fan. Big time! It'll be interesting what the mpg numbers are when you get a chance to take a cruise trip. If the normal LS magic works it should be in the 20's range. Stock gears may be a deal mpg killer till you can get the od tranny in though.
Im sure the 4.56’s right now are killing it but i just been cruising on all the backroads. I do have a Mitsubishi starion that i swapped to a 6 litre witha turbo that makes about 700hp and it has a t56 trans and that car will get well over 20mpg on the highway cruising at like 80mph with the AC on. They are efficient motors when they are happy.