After an exhaust and Air Cleaner/backplate upgrade I have noticed that I'm getting less than 40 MPG. Any ideas?

 

What were you getting before? A power commander might help sort this out. But it all depends.

 

Stage 1 download. HD A/C ans SEII slipons. mileage went down some, average 35/36. Installed PCIII and it went to average 42/46.

 

Did that include a dyno, or just a canned map?

 

Buy opening up the intake and exhaust you've allowed the engine to move more air. More air + the same amount of fuel = a hot, lean running engine. So fuel has to be added to the mix to even things out. Also, the added power you're getting from your upgrades just might have you twisting the throttle more and you're unaware that you're doing it.

 

yeah...I do think the added power has something to do with it....I get on it a lot more than I used too....just because its fun!

 

Yep I heard that, the mileage on my scooter does great out on the highway.
Now you start head up them hills and running around the city it drops. Sure is fun twisting that throttle a time are too!

 

35 to 44. about 40 average.

 

more horsepower less mileage.

 

I was getting 40-almost 50 stock. After SE A/C, PCV, and pipes: low 30s, 35 tops on the freeway.