I built this truck for my brother over the last 6 months and really need to get it back to him next weekend. The engine tuning is essentially done and I've begun playing with the transmission. I only started learning/researching the transmission since yesterday. It drives excellent.....I just don't know what to look for in the logs to see if anything stands out as far as transmission goes. Not sure how accurate the GM fuel economy display in the DIC is once the truck has been heavily modified but after a 43.5 mile light cruise (I use cruise control all the time) it read 21 mpg. Pretty good for a 700+hp 1/2 ton pickup. Thanks