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Recently Bought a 2500 Suburban 6.0 with 130,000 miles for towing a 8000lb travel trailer. Upgraded the stock intake to a spectre cold air intake and installed a bullydog gt tuner. Im not real impressed with the upgrades, to be honest im not sure i can even tell the difference. In fact it seems to be getting worse mileage with the tuner. Getting about 17 on the highway with no tune and 15 with. The towing mileage is horrendous. Lucky to get 7mgp. Is this right? I pulled this trailer around with my ‘13 silverado ltz 5.3 for about a month and that truck had way more power than this Suburban and i was getting 10-12mpg towing. The only reason i sold it was because the trailer was just to big for a 1/2 ton. Even with a weight distribution hitch, it was a white knuckle ride with all the sway. The 2500 Suburban fixed that but very disappointed in the power and fuel economy. Has this been anyone else’s experience with the 3/4 ton 6.0? Thanks
 
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