MPG 20 or not

[PCBeach]

Hello Webster,
I consistently do 20.3 mpg on the hwy. Now have 16K miles. Here are the parameters I have always posted: Automatic, 32" tires, 35# pressure(the door placard says 30# for 32" tires), Mobile 1 synthetic since 3000 miles, at speed limit, cruise control where possible, going 335 miles from Panama City, Fl to N Atlanta, Ga.(which is a flat run)and checked by actual fuel used upon arrival with no city driving!! So I cheerfully inform all H3 fans that GM has done a great job on posting accurate mpg figures!!!!!!!!!!