Have you tried different fuels?
I realize gasoline is expensive, but I have fueled up with high-test, and at times with 100% no ethanol gasoline in our: V10 2016 Outlaw.
I had usually got 8 mpg, and loaded down as low as 6 mpg. Now I have seen 10 and 11 mpg. It is not consistent, I blame it on the more expensive fuels for the better mpg, I just do not want to spend the money and time searching out the 100% gasoline all the time, if that is why the increase. Believe me, I check every fuel up, and sometimes it goes back to 7.5 mpg or something.
I also try to not drive faster than 65 mph. Keep the tires properly inflated, and wash the front end off before a trip, using a sponge mop to reach the higher part, lol.
Back 20+ years ago, driving my big old hog (motorcycle), I would use the same brand all the time, like BP, then I would stop at Marathon and fill up (always not more than 2/3 low. Then I would get better mileage. So I would switch over to find out back to the old rut of normal mpg.
I began to believe the blend of different manufacturers was why the better mpg, and that may have been, and maybe why the RV does better too.
So, I try not to be too loyal to one brand, and likewise to the octane. Seems 8 to 10 is the result.
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Rusty
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