I was wondering what your car's MPG are like? Just to see how bad I have it with mine.
I have a 2002 Mountaineer and I average 13.6 Mpg this is with mostly driving around the city. I'm not sure how much Highway miles are like because since i just got it about a month ago, i haven't been able to take it on any descent size trips.
Let me know what type of cars you have and what their City/highway MPG look like.