Thanks for the tips guys. I think I'll start with the plug first (cheapest) - NGK seems to be the preference on this board. I'll also look into the power commander - I haven't heard of that on a quad before.
Octane, you lost me with ""it is possible to have a DA of less than the actual altitude MSL". As for altitude, I ride above 5,000 100% of the time, with typical excursions up to 9,000+.
Now that I think about it, you might have hit on something with the clutch set-up. I bought my quad in Sacramento which is a lot lower than 5,000ft. I'll have to check the settings. Probably take me a week or so with the holiday weekend but I'll be back!
Hey, there's the cheap shot I was asking for earlier!
Primer you smartass (he's one of my riding buddies) I fill from the same gas pump you do (your turn to buy next time), but you're probably right about the heavy thumb. Now that I think of it, my poor gas mileage is probably due to all that idling waiting for you to catch up! 
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Regards, Mick
2008 Sportsman Touring 500 Stealth Black
Rack Extenders front and rear, Stainless Steel bumpers front and rear, 3 way Headlight mod, HID Lights, Mad Dog mirror, RAM GPS mount for Garmin 60csx, WARN 2500 RT winch, work lights with K&S handlebar switch, Bad Boy air horn, hand guards, Touring model large Rear Storage bag (Polaris), Fender bags (Polaris), Wild Banchee(lil Mule) rear utility rack and mounts, front mounted Rotopax gas cans, Maxxis Bighorns
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