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I went -1/+2 and I love it in the canyons and on the track. It's made tight cornors much easier and way better acceleration in the mid range. However I do miss being able to get over 150 MPH. I think my top speed is about 125-130 now.
Miles per gallon is better in the canyons and worse on the freeways when I'm trying to keep up with literbikes. It's not too bad if I keep a little bit higher tire pressure and tuck in on the freeway. It looks a little silly to be tucked going 75, but it actually saves a bit of gas.
Your engine will go through more rotations than before which will make it burn out a little faster. My bike is reving about 10-15% more than it used to on the freeway, so I assume the life of the engine won't be shortened by more than 10-15%. But if you keep the rpms low whenever possible and ride a little slower on the freeway it won't be too bad. If you do a lot of track days or canyon riding, it's totally worth it.
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