I usually use Shell 93 only. But I can find Exxon 93 for $0.15/gal cheaper than Shell in my area. Is it worth the switch?
We don't have Exxon fuel here however our esso brand is the imperial oil and Exxon equivalent.
From experience I've tried many different fuels and in my vehicles I never really noticed any difference however my Harley is a different story.
It's got an S&S big bore kit,cams,port work on the heads and they were milled for compression(and to flatten them perfectly)dyno tune etc,etc.
My bike is very picky when it comes to fuel. My bike runs great on shell 91 v-power,co-op 91 octane and petro-Canada 91 octane.
The husky/Mohawk 92-94 octane stuff is hit and miss,I think its dependent on how old the fuel is. My bike also looses 5mpg with Mohawk/husky fuel so I don't bother with it anymore.
My bike pings audibly with esso 91,fasgas 91 and basically every station other than the 3 I mentioned above.
Only my bike pings though,my vehicles run fine on any of the above fuels however I use my bike as the standard and if the fuel is no good in it,then I steer clear of the station/brand altogether.
I suggest trying out both stations and run 3 tanks of each brand and track mileage. Then go with the one that gave the best results.
15 cents a gallon isn't a lot of money in the long run however it is better to have in your pocket than an oil companies.