you think 2.5's are bad, I guess you never saw mine in the revo. I used to hate the 2.5 in the maxx but i learned from that engine how to better tune an engine. Now about 3 engines later i think i have become rather good at tunning. My 2.5 now runs around 250 and has balls of power. My sirio is another one that has its ups and down. Im on my second sirio and i can get this one to tune. Maybe its still breaking in but right now i cant get a decent tune outa it. My previous sirio tuned like a champ but i think the one i got now is probly a bad seed. I would say 99% of engine problems are related to tunning. And i can say that because i have tuned a lot of peoples engines that are just starting off. And the idea of 33% fuel is awesome. It will run the engines cooler, give some more power, and hopefully make a lot of people happy. I already have 3 gallons ordered so i hope they come in stock soon like they should.