2023 Sierra 1500 AT4 3.0L Duramax Diesel 650mile roadtrip tested
This truck is a 8/10 - reason for loosing a few points is the wide temperature based MPG inconsistencies. With a swing of over 5mpg with a 30-40deg temp difference seems wild to me - if I had to guess I'd be leaning on the side of air density changes with temp
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She Thought It Would Fit...
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