cl5man

So i've been flying planes for many years, 20+, and i've been playing with the 1/8th buggies for a while. I've been making my own fuel for about 6 years now. Its been so long, but I think when I was buying fuel for the planes i usually got the byron 15% nitro with 20% oil. When I started mixing my own gas at a 15%nitro content i noticed a huge improvement in the planes. Example would would be not being able to hover with the store bought stuff vs being able to hover with my own stuff. Sorry but thats all i've got to compare it with. I've also ran the exact same mix with my cars since i've been into the nitro cars. Don't have anything from the store as far as fuel to compare in the cars. My concern is I've recently got the bug to get the car going again. I mixed up a fresh gallon of 15% for the car, it ran great!! But its been a couple years since I've run it. At the track the electric cars and the new "lipo" batteries are so impressive!! I couldn't settle for being outdone by an electric buggy, so I decided to to mix up another gallon of fresh fuel at a 30% nitro content. I know they sell it, I know its not all that uncommon, but in my plane world the home brew ran so much better than the store bought stuff. Should I worry about running my 1/8 ofna with an OS .21 to the ragged limits with my 30%? I haven't made it to the track yet with the new fuel mix, but in front of the house on pavement it hauls!! Ive been running the homemade stuff for a few years in the buggy, never had any problems. Is the home brew stuff really that much better than the stuff you pay $35 a gallon for?? Will I being replacing the engine soon?