Well....everyone of these motors must be different with all the different responses. I can only hope you are monitoring your runs to see the real world. Let me put it to you this way. A long sustained run on a nice straight desert road....or several all out passes down the 1/4 mile, will over time take it's toll. On a lot things for sure, but lien conditions create heat like it or not. Better to be on the safe side and make sure you are delivering enough fuel. I can tell you all for certain my 62mm ran lien and needed more fuel. I can tell you for certain my roadster falls short of the 1/4 mile needing more with a 65mm. The roadster runs 12 flat all day long, but with the new tune I just put in her, she should break into the high 11's. The coupe has yet to see the track, but I already know she's faster than the roadster... Just play safe, or it could be at least $3K mistake if you can find a motor.