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				Originally posted by spoogenet  
I didn't see any noticeable increase in my gas mileage when I switched to synthetic. 
 
I still change mine at or before the Honda recommended change intervals, I don't try to stretch it out for extra life.  I only change based on mileage now, though, I don't pay as much attention to time as I did with natural oil. 
 
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Umm.. yea I am pretty sure you won't get and performence gains at all from synthetic.. just more protection for your engine....and choosing a weight oil can depend on a number of things.. if your oil pressure is a little low maybe cause its hot as hell outside, it's cause it's thinned... use a heavier weight.. if it's winter use a lighter weight..