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Sorry, I've been away a while.
I can report a best ever of 19mpg. 55 mph, very smooth freshly paved flat parkway driving with a minor about of city driving. 70 deg temps. I retracted my mirrors to reduce drag--they extend out for trailering and I normally keep the out. I don't expect to ever exceed this amount. Typically I see 17.5 to 18 mpg, which I'm totally thrilled with for a heavy Silverdo Dually.
Since then I've run out of the additive and saw my mileage go back down to the typical levels.
I've also carried a 4000 lb camper with it, and typically see 12-14 mpg with that. Speeds between 60 and 70, mostly on the lower end. 12.5 mpg average. I only saw 14 once in Florida, and I was using two cycle oil instead of Optilube. I use cruise control a lot unless forced off it by traffic. I'll be driving 1000 miles soon. I want to try driving a bit slower although that is hard to do in traffic and impossible at night with speeding truckers. I'll report back more later.
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