RE: Fuel
Mix your stuff yourself ... methanol/nitro/and Klotz Super Techniplate ([link=http://www.klotzlube.com/proddetail.asp?prod=KL%2D100%5FQuart&cat=8]L I N K[/link])
And YES ... if engine-manufacturer requires 20% oil .. do so.
Sometimes the fuel-manufacturers also supply the oils they use , you can add that .
Bud ONLY use brand by brand .. don't mix .... some oils don't like eachother.
BUT : What is this NITRO question doing into the GAS section ? ;-)