Since i bought the bike i have been using 93 and i am getting 47.9 mpg, no popping sound in deceleration. I know the manual says that i can use 87, but not sure if i should? What you guys using ?
I'll check my actual manual when I get home but from the online one : http://images.triumphmotorcycles.co...et twin/25 09 2015/ohb_dp-de-de2-du_en_01.pdf
They seems to want you to use 91, maybe I'm missing something?
"Your Triumph engine is designed to use unleaded fuel and will give optimum performance if the correct grade of fuel is used. Always use unleaded fuel with a minimum octane rating of 91 RON."
The RON rating does not equal the typical US octane rating:
USA (AKI/PON) --- Europe (RON)
87 = 91
89 = 93
91 = 95
93 = 98
So when the manual says 91 RON, that's 87 in the U.S. With a 10 x 1 compression ratio, you don't need higher octane. If you are at an iffy location, and want to make sure you don't get something too low, you can always fork over the cash for higher octane. Typically, in the USA, you don't have to worry. If you are putting premium gas in your tank, you are essentially burning money.
The better grades of brand name fuels contain better (more than US EPA-required) additive packages. From experience, they reduce carbon deposits and keep throttle bodies, etc. cleaner. Hardly a major expense although I'd agree in a Bonneville you won't see much if any mileage improvement. Generally I use BP/Amoco or occasionally E-0 when I spot some on the road.In other words; "I love giving money to the oil companies for absolutely nothing in return."
Do we know that for sure on the latest version of this engine? It would be extremely interesting to know if ignition timing maps do adjust for fuel quality based on knock sensors or other parameters.Since our bikes lack knock sensors which can advance the timing with higher octane, little real or measurable performance or mileage boost. Pity...
The real difference in your example is the no-ethanol vs ethanol fuel. Ethanol has something like 1/3 less energy than real gas. So you have to burn more of it per mile.93 real gas (no ethanol) 60mpg. 91 Unleaded (ethanol) Gas 41mpg. Same trip, roads, riding and revs. So I don't measure the "You don't get what you pay for" .
Loads of E-0 91 M+R/2 in Madison though..., so THAT'S an easy test for you to try. Figure easily 10% more MPG. http://www.pure-gas.org/index.jsp?stateprov=WIYou don't go from 40 mpg to 60 mpg because of gas type/octane. This is exactly why science isn't conducted via misc anecdotes.
But as they say, if it feels good then do it
I do wonder though what the miles per dollar between the 87 and the 93 is though ... but I'm not so much that I'm going to do research and math.