I'll add to mine from before.
My 2005 Crew/Short bed Duramax Banks pumped up gets 10-11 pulling a trailer(loaded) at 70-80. This is either pulling the car trailer or the boat. The car trailer is open and the boat is 13,000 wet full of fuel. (1994 Cigarette Top Gun-38 foot). If I pull the car trailer empty it gets 11-13. The Banks goodies did not really effect the mpg but the power is worth the $$$. 150hp and 3003#'s of torque for $1500.00.
One of the other at the dealer that I vintage race with has the Bully Dog on his and loves it.
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Chris
1967 Yenko Stinger YS-199
2005 Duramax LLY/Allison 5 speed/ Banks Power
Southeast of Disorder