See if that worked. The 15 best, i have no idea what that means. Might be for a set period? Not sure. I do know i clocked the miles in the smaller range and I got around 12 around town. So with that , and the roughly 50/ 50 highway and city , it should be about 16 highway and 12 city. Or I'm getting better then 12 city and a little less on the highway. But I dont think thats right. Its 6 of one, or half dozen of the other. And ignore the high mpg , i was taking the picture while driving so was coasting downhill.