Worste mileage from a rear tyre was straight after I fitted TORS and did a few other things - not so much because of the extra power but because I couldn't help 'trying it out" at every opportunity. :D
 
I had the TORS and under seat K&N installed with the tune. Rode it about 150 miles. It seemed to me that there was a improvement in power and a decrease in MPG. Might of been because I kept opening it up just to keep listening to the sound. I'm sure my tires will suffer also.
The other upside is it makes me smile more.

10,000 mile tuneup coming up soon.

that is what happened to me, I added the exhaust at purchase then added the K&N last year, it became louder, seem to run better, but mpg is down 8-9 miles per gallon
 
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