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GMCerpillar's Achievements

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  1. I read this thread with a lot of curiosity. Just got a 2018 Sierra 1590 5.3L, levelled it, added tonneau cover and swapped up to 20” rims with 275/65R20 Toyo Open Country CT’s (34”). I’m averaging 20.7 L/100KM’s so far. Brutal. I wouldn’t think it was so bad if I hadn’t traded up from a 2016 F150 5.0L, also levelled with tonneau on 20’s (285/60R20 Firestone Transforce). I was getting 16L/100KM average in it. The Toyos are bigger and far more aggressive, might be why it’s so much worse.
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