Salaam everyone... does anyone facing knocking issues?... My father got the car filled, don't know from which pump but it was knocking badly when the car was running on the engine at snail speeds...
What ratio of high octane and supreme should one use for this car?...
i use 30:70 in my other car... Was planning to go 40:60 for the Prius... Recommendations will be much appreciated.. 
Cheers...