on a recent trip from benton ky back home to kirkwood mo i ran into a problem. my a/c compressor froze up which cause my belt to break. that belt was brand new when it broke. after some tinkering around i ended up getting a smaller belt to by-pass the a/c. the didnt work so figured why not. driving back i managed 29mpg, a week later i filled up and checked the mileage again, and got 25 which i expected. ive filled up a few times since then and averaged 25-26 mpg that was untill today. i checked the mileage today and got 23mpg. i do alot more highway driving now, i drive about 70 miles round trip. so i need to figure out a way to improve my mileage, i know that i need to replace the plugs and wires but i dont really expect to much of a gain there. i thought with more highway driving my mpg would go up, instead it has gone down. for most the drive i drive 55-65 mph.