Different bikes are tuned for different gas. As are different cars. My 2002 636 and our 1998 import family wagon both specify and get run on 95+. My old 1989 MX-5 is specified and is run on 91. My last turbo car (a heavily modified 1992 model) ran on 98, and would run but like a sack of shite on 96. The price of mods. My parent's 2001 NZ new car runs 95+.
Age of vehicle is irrelevant to what it is tuned to run on. It comes down to the tune, either factory or aftermarket. In saying that, a lot of cars in particular, will have a computer that can cope with different fuels. It just adjusts tune to account for it.
"You, Madboy, are the Uncooked Pork Sausage of Sausage Beasts. With extra herbs."
- Jim2 c2006
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