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I am getting 18.3 avg in awful traffic-heavy roads in west central florida. We haven't quite figured out how to build highways down here yet-- plus we keep inviting the entire country to come visit.
I treat the fuel with the standard Drew Cocktail also.
I have an 02 2500 5speed reg cab SO with 5 inch exhaust, 2790 napa air filter, stage 3 jammer injectors, edge comp box and i am getting 17 on the highway with the edge on stock setting. I was getting 18 to 19. Oh yea the 17 mpg was pulling a 3 seater jet ski running inbetween 70-90mph.