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I put the KO2 on mine the 275/60/20 and the weight difference was drastic. The black bear tune made up for it plus it's faster with heavier wheels. Those wheels caused me to loose around 4 mpg. The tune made up around 2mpg.I'm not sure if they feel heavy under acceleration but by Toyo's statistics the 305/50r20 weighs 4.5lbs more per tire than the 275/55r20. What's an extra 20lbs when the vehicles weigh 7k... Of course the 6.2L owners don't feel the 5.3L owners pain.