Thank ya'll for your great suggestions.

As everybody knows that heat of Texas gets nasty and summer is stomping at our doorstep. Temperature has started hitting 80F but lately it's pleasant. As winter is trying it's utmost to give us after shocks and lil bit chill factor is still here until April. But anyway, in summer heat, best bet would be 10% and yes I have not seen 5% at LHC where I buy my fuel. I think I'm gonna stick to 10% for summer.

One more question I'd like to ask back in my home country not my present country USA, we used simply 80% methanol 20% castor oil, there is a particular name for it I forgot and that's combination I read here at rcunivers is used in UK as well. There is a concept that if you used nitro regardless 5% upto 20%, it makes your engine work up and the engine's life gets cut short than the regular life span as it runs higher than it's capacity. I don't believe Nitro in anyway reduces the life of engine makes it do more than it's capacity. Do you think is it true?

Mody