After I had the 26h's put in(close to the 203's) and re-dynoed my mileage actually went up 2-3 mpg.

 

Completed my tensioner, oil pump and 204 cam upgrade on my TC88 last week, rode 925 miles this weekend through all types of terrain. I averaged 37 - 38 per gal. actually got 39+ on one tank. I am running the Dolbeck tuner, runs ya about 250 to 300 bucks but support is great. My bro is running the same tuner on his 11 TC96 he gets around 41+ mpg on it. I've called Chris with Dolbeck with every change I've made, really great guy and great advice always. Check them out easy install easy adjust.