PapaD

14 silverado LTZ Z71 crew, 6'6" bed, 5.3, 3.42, stock everything, 16k miles. Went on 92 mile freeway run (each way), no traffic, no wind, 92 octane, 95 to 100 degrees with AC on, averaging 65 to 70 and got 26.5 mpg one way and 26.1 coming back. I drove like there was an egg under my foot and was in V4 mode except on uphill grades. Truck does great on the highway, generally gets 15.5 to 17 in city. Was getting 22 to 24 highway and switched to Mobil 1 0-20 oil and mileage went up to 26; not sure if the oil raised highway miles but mileage went up right after changing. So far, truck is exceeding my expectations.