I was tuned for c16, but there isn't any locally right now. I have a 2 tuned maps, one agressive c16 map, and one safe map on c16. I was wondering if using c12 on the safe or less agressive map would be ok? I really need an answer soon. Thanks guys!

 

Call your tuner, no one has access to your MAPs.

 

Ask your tuner for sure, he will know just how agressive the safer tune is, c-12 is very good fuel, but c-16 will handle boost and timer better.

 

how about a real answer: NO