Quote Originally Posted by lglglg View Post
I just run my tank down and refueled with Shell VPower last night. Hope it will somehow improve.
I've done a series of high octane fuel tests with my 1.3L engine, minimum of three full tanks to ensure all the old 91 ron is flushed out, and run 98 ron premium shell fuel

From what I could see, made virtually NO difference in either performance, or actual mileage distance.

Previous car (Commodore) got a marked improvement on distance, but not in performance. I think the 1.5L Vtec motor may get a better result, given it's tuned to give higher perfromance.

Next thing i'm going to try is three tanks of 10% ethanol blend, so see what difference it makes on mileage, my bet is.....not much