Break-in Fuel Recomended?

[NJRC]

What would be good a good % fuel to use for Break-In period? Before I cank over my new Savage .25, I want to make sure I use the right % fuel and or good brand. The LHS that I bought the truck from told and sold me Monster power blend 10% nitro would be good for the break in period. They told me to use pretty much the whole gallon before I switch to like 20%. But after reading the manual, it specifies to use 20% for the break-in period. Which should I really use before I start to pour it in and regret it later on?

Thanks

 

[kazi]

I used 18% Ultimate fuel, this fuel has extra oil to enlarge the OS engines live. worked ok.

 

[AC48]

I would suggest 20%...mos tengines are designed for 20%