I get up to 26 at that speed with mine. Granted I did a few things with mine, got the tickets to prove it, oh well,,, To the OP, run the higher octane, it's worth it. Just in driveabilty it's worth it. Don't cripple your R/T. It'll still be stout with 87 but so much better with 91/93. Mine's a stick. I get in so much trouble in NTx and the Panhandle with this. Glad they didn't nail me at 142.
