For a street car running pump gas, getting the CR right should top concerns over flow. I doubt that performance at street RPMs will vary much if at all, but 'street' use can mean different things to different people. And if you already have your pistons, you may have less of a choice, and need to pick based off compression ratio you want to be able to use pump gas, which can also vary. My pump gas can be from 86 to 91 octane, which is enough difference to matter. If you are close to the edge and run low and have limited gas available. I would rather use 91 octane in a car built to use 86 vs using 86 in a can designed to use 91.
|