low mpg

I just picked up a used '14 CX-5 with 58k on it and drove 3.5 hours into a winter storm on I-80. The best average gas mileage I got was 20.5 mpg. Is this normal? I was driving into the wind, but loosing ~10 mpg seems kinda drastic. What am I missing?

Ok, so everyone with a protege seems to have the same problem, however i dont think the solution has been the same for everyone.. or some ppl just THOUGHT they fixed it with something but it came back.. so here it goes. I have a 02 mazda protege5 2.0 i got the car all messed up, crashed from...