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07 Z71 see sig for mods. Recently hand calculation indicates around 15 mpg city and 16 mpg highway @ 65 mph. Winter gas is ~14 mpg city and 15 mpg highway (sometimes less than that).
Just pulled a ~3,400 lb camping trailer and got ~12.5 mpg round trip combo highway and rural driving with some steep grades.
BB tune made a big difference to correct the speedo (after larger tires) and tune for 89 octane. Keep in mind that I have the 4l60e tranny and 4.10 gearing.