I use the 87 Octane for the most part. But if it has been sitting for a while I always put the highest Octane I can get in it for the start of the trip just to spruce up the gas a little. I don't know if that really makes a difference, but we've had no issues with ours. We have the 26k chassis, with a 37' MH, and for the most part we average right around 8mpg. And that is doing it the old way, dividing the miles by the gallons of gas used when we fill up each time, not depending on any onboard computers.
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Mike & Charlotte
2014 Newmar Canyon Star 3610
Orange County, California
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