2005 C4500 mileage

Made a 1200 mile roundtrip this week, half empty and half towing a 22' sailboat that was trailered low, in the slipstream of the truck.

Cruised at 62mph, tried to avoid heavy acceleration and braking. Left exhaust brake off since load wasn't very heavy, maybe 3500#.

Unloaded mileage: 13.8mpg
Combined loaded/unloaded mileage: 12.5mpg

Not bad - I think the overall mileage is getting better as the truck is now broken in at 32K miles. I have been averaging about 9-10 with the heavy hydraulic boat trailer and 12,000# boats.