1)Speed 97 makes a difference in hot conditions(Summer and bumper traffic) and in pulling high speeds(200kmph+), than any premium fuel.
2) Of all the premium fuels I find IOC Xtra-Premium very useful and havent had any knocking issues at all.
3) I try to stick to Speed 97 for city commuting and Xtra premium for the highways.
4)Almost Forget Speed 97 gives much better mileage than any premium fuel..

Completely agree with Akhil, that a Clean Fuel makes a huge difference(atleast on my R1)...




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