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i did the 91 for awhile and did not notice that much difference. I had the 87 with a custom trans tune, but then went to the towing tune again about 3 weeks ago and never looked back.
OK, looking for some clarity here . . . I am on the 87 tune and now that Spring has sprung (or is springing?) I am going to change it up. From all of these SC threads I am going to check out the vaunted tow tune (also, it's boating season coming up ) but the spread between 87 and 91 octane up here in the wilds of the frozen north is 15 cents/litre, which is what? 60 cents a gallon, give or take? We're currently paying OVER $1.50.litre for 91. 60 litres is $90. In real money. (heh-heh).
Somebody here just said you can run 87 on the tow tune . . . what is the Web-consensus on that?
I've been running the 91 tune for about a year but as soon as 91 went over $4 a gallon I switched back to the 87 tune and dropped the TM down to 4.8%. But now I might just have to try the tow tune.