I've tried looking but I've got a lot of unanswered questions about fuel.

1. What's really the difference between 10 and 30% nitro?

2. How do you know what fuel works best with what size engine? Ex. Should a .40 use 10% 15% or 30% fuel and why.

3. Is there a brand that is more suitable then another.

4. Am I limited to getting this from my local hobby shop or forced to order online at extremely high shipping costs. Is there somewhere else I can get nitro at a better deal?

thanks in advance!

mike<br type="_moz" />