I have had some surprising MPG results too. These pics are from a round trip on 55 mph, mountain 2 lane roads. First pic is the one way, second includes the trip back. Unfortunately, most of my driving is in town, which nets 16-18 MPG.
Haven’t been able to hit the 1/4, but ran the 1000’ at a local track.
Ordered GMPP exhaust and intake, 20% off, free shipping to dealer, installed intake myself and used points for the exhaust install. Ordered late Friday, parts were at dealership Tuesday. About as hassle free as possible.
Just finished installing my intake an hour ago, it really is straight forward. Trickiest part was getting the bottom in correctly. I ordered the exhaust and intake from GM performance with 20% off and free shipping to my dealer. Ordered it Friday, arrived at dealer today. Picked up the intake to install myself, then dropping off at the dealer tomorrow at 7:00am for flash and exhaust install.
I am still trying to get in the habit of turning it off. It would not have made a difference for the trip I mentioned, there were no stops.
It has the 6.2L, got 23.5 mpg on first 130 mile road trip at 55mph, looking like 17 mpg around town.
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I feel your pain, took 4 months to get mine. That was only after placing the order in late September (THE day the order banks opened). The wait actually began in late May when GM announced the 6.2 option on the Trail Boss, was ready to place my order that day?? It will be worth your wait.
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