Hi All, 4 years ago i was getting 23 mpg, last year i got 21 mpg towing a trailer with my bike on it. This year towing the trailer with bike i got about 17 mpg. Any ideas why i am using so much fuel. I have changed the air filter already. I have an 04 FX4

 

When was the last time you replaced the plugs? Are you running the A/C or letting it idle more often? Are you driving faster or on hillier roads?