Consumer digest ran an article a while back about the “top 10 ways to waste money on your vehicle.” I think #2 or #3 was filling up with 93. The reason being that, especially in a time where gas is over 3$/gallon, less people are using the 93 tanks, so the fuel sits longer, and doesn’t get mixed as often. This cause more[/i] condensation in the tank, thus more water in the fuel, and diluting the gas to the point where it is no better than 87.
That said, I always use 93 for my bike/ATV. Oh by the way, #1 was Insurance, and one of the top 5 was getting your oil changed every 3K miles. They say that the dealer will tell you 3K because they make money on the labor, but the manufacturer will say more like 7K.

 

I think folks are coming around. Use the lowest grade possible. If you hear knocking, upgrade a level. I use my extra money to contribute to the Tahoe Yamaha fund...

 

Yes it's ok!

 

i thought you were buying stuff for the wifey? like lingery and stuff?

now about the oil change...the truth can only be told via oil analysis...car manufacturers want to do 3K-4K to make some bling, but usually around this time the oil is still working well and hasn't sheared to a lower weight, etc...but beware, some oils have sheared to a 20wt after 1 month of use!

i often run dino car oil in my bike...UOA from a friend who runs valvoline dino usually comes back recommending him to change it at 2800 miles. bike specific oils are better...and even better...amsoil...but that's bling! if i used that stuff i'd ride forever.