Re: a bit hard to believe
Can't speak for him (and I wasn't asked but I think I can chime in a little on this) but on my ECSB 2006 Duramax I remember hitting 20mpg with regularity on my commute. Mostly highway for about 30 miles a day. Straight pipe and a tuner, stock sized tires. After yanking the emissions business on my prior 2009 CCLB, did around 19mpg. Not fantastic, but for a vehicle that size, I didn't feel it was terrible.
-J
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