I'm averaging 14+ in the City and no more than 18 on the highway. I am on stock wheels and tires with no mods in a 14 SR5. I think something is wrong...
2014 TE, this summer I was averaging 20.5 on display and 21.2 calculated w/ 255/75/17 BFG KM tires. Now in winter I am getting about 19 on the display and 19.3 calculated. Pretty much exclusive city driving, 40 mph no stop and go traffic.