Just crossed 30K miles in the '20 Silverado 2500HD with the new model year gasser 6.6L. She's handled everything I've thrown at her and has not disappointed. I cannot compare it to my '14 or '01 Duramax's, it's just apples to oranges. I will say pal, ya worked hard and if ya want a diesel, get a diesel if it fits the bill. They are awesome to drive and you are set for whatever adventures await you and the Mrs. thru your golden years.
Overall avg. MPG showing on the dash calculator is 14.8 for lifetime. This is from the day I bought it, and includes daily driving, towing, idling, etc.. Hand calculation is .5-.75mpg lower than dash. Just put 1800+ miles on her and she had a hand calculated avg. MPG of 17.6.
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Well guys, just bought my second yota in my life today. First one was a SR5 4x4 from Germain Toyota in C-bus off Brice RD exit. That was 1985!IKS....and it's sexy AF