You said you already have a 1.2, why not slap that on the front and give it a try. Alot of people are flying the 25% wildhares on os 1.2, its just not gonna be crazy ballistic like the 1.6 is. I dont know how much more fuel the 1.6 uses over the 1.2 but I doubt its that big of a difference when it comes down to it. GL with what ever you decide!