I have a 2012 wrangler they are rated for 16 and 19 miles per gallon. I have never seen that mileage, the least I get is 20 and a lot of time it hit 22 to 24 miles per gallon. This is combine driving not highway. Actually it is more back road driving, now it is less than 50 or 55 these jeeps are like bricks going through the air.
Doesn't Shell 93 (vpower) have extra detergents added in, which may be beneficial in the long run? If so, wouldn't it make sense to fill it up with that every couple of tanks, not for the octane but for the cleaners?