I'm thinking about changing out my stock 16T sprocket for a 17 or 18. I only want to change it once, if I get the 17 will it be enough or will I be coveting an 18 later? How much is the response changed by increasing the sprocket size? I'm not unhappy with the 16, I'd just like to try something different, maybe get a little better mpg by not working the engine so hard. I don't look for 6th very often, by the time I hit 5th I'm usually doing 70 already.