i get about 17mpg city/hwy averaged but that's with a lift and larger tires and some mods (mileage has been corrected for larger tires/gears and over 200k miles on her). as for fuel costs that depends on the cost of the fuel, i'd say i usually spend about $120-$130 a month.

 

I live in a rural area. When I drive conservatively, 18-19 mpg average, but when I hotrod it, 15-16. One full tank usually takes me about one and one half week.

 

I get about 16 mpg and 400 miles per tank full, im 6 miles from work and I dont go on the highway very often. The long bed trucks, like mine have the 30 gallon tank. Costs me a hair over $50 per fill up every two weeks maybe. So thats a little over $100 a month for me. My mods are listed below, plus I do like to floor it once in awhile.

 

I've had my truck (specs in sig) for 3 months - I've put over 5000 miles on it - and my mileage has been from 16 to 20, no better, no worse, using 87 octane, mostly E10. I usually run it till the low fuel light comes on, then fill it. At $2.25 a gallon, this is usually 50 bucks a pop for around 400 miles. Best mileage is on the highway keeping it around 70, I haven't tried slower. Worst mileage is hard city/suburban driving, followed closely by 80+ on hilly Interstates. Day to day with short trips, it's getting around 17. I use cruise control everywhere it's practical and safe.

 

I have a 03 sport single cab andI can get about 335 on a tank and thats all city driving. Now on the highway driving in the mountians i get about 400+. All in all i'm pretty happy with it. Matter of fact she just turned over 63k and shes still plugging along just great!