Premium gas or regular?

high test= high rpm

donthaveakawman wrote: high test= high rpm

Well you better fill your tank with some 114 and head for the moon then if thats all it takes! :woohoo:

hey if it gets good gas mileage why not spring for the good stuff.

i always go for the premium in my bike .

me too unless I prepay with a bunch of quarters and nickles.

I guess it really doesn't matter unless you are running upwards of 11.5 to 1 compression.

Just to be different. Wasa sucker for prem for years till....

I Read a article years ago that talked highly of going with approx 60/40 mid grade and premium to get the benifits of the higher octain and a slightly better additive package..... so thats whta I usually shoot for, gal and a half of mid and a gal of prem.

Gonna look into trying to find pure gas this and fresh mid oct has got to pick up a few tenths plus of HP.

Bingo

martin_csr wrote:

Motor Head wrote: Here is a read that some of you might enjoy on Octane and fuel. Get a cup of coffee and have a look.
www.faqs.org/faqs/autos/gasoline-faq/part3/preamble.html

Thanks. Section 6.13 & 6.14 seem to have some of the most useful info... to me anyway.

6.13 Can higher octane fuels give me more power?

On modern engines with sophisticated engine management systems, the engine
can operate efficiently on fuels of a wider range of octane rating, but there
remains an optimum octane for the engine under specific driving conditions.
Older cars without such systems are more restricted in their choice of fuel,
as the engine can not automatically adjust to accommodate lower octane fuel.
Because knock is so destructive, owners of older cars must use fuel that will
not knock under the most demanding conditions they encounter, and must
continue to use that fuel, even if they only occasionally require the octane.

If you are already using the proper octane fuel, you will not obtain more
power from higher octane fuels. The engine will be already operating at
optimum settings, and a higher octane should have no effect on the management
system. Your driveability and fuel economy will remain the same. The higher
octane fuel costs more, so you are just throwing money away. If you are
already using a fuel with an octane rating slightly below the optimum, then
using a higher octane fuel will cause the engine management system to move to
the optimum settings, possibly resulting in both increased power and improved
fuel economy. You may be able to change octanes between seasons ( reduce
octane in winter ) to obtain the most cost-effective fuel without loss of
driveability.

Once you have identified the fuel that keeps the engine at optimum settings,
there is no advantage in moving to an even higher octane fuel. The
manufacturer's recommendation is conservative, so you may be able to
carefully reduce the fuel octane. The penalty for getting it badly wrong,
and not realising that you have, could be expensive engine damage.

I buy the upper cylinder lubricant on occasion, the one marked as octane booster. I guess wd-40 would be all the same.

Forgive me if I am repeating anybody... I haven't read every post, but the topic is a fun one! Worked at Moto Milano in Maine for a season, we ran low test in everything (yes 87 in 1098, and 1198's) the reality is that the octane rating (the higher the number slower the burn, and less energy) isn't stable in storage. So when it sits in the ground two or three times longer than 87, it's octane rating maynot be what you are paying for. Also with most states running a 10% or more ethanol fuel, the longer it sits in the ground the more water it has time to attract (the tanks are vented to atmosphere so we can pump them) If you are really worried about the possibility of nocking on your bike just retard the ignition 2-3deg with the extra energy in the 87 you make more power on 87 than 93 (actualy tested that on the dyno at the shop) I really can't say that I see ethanol as the issue in our fuel, we just need to build for it. The more alchohol in the fuel the less problems you are going to see with water, as it is going to bind with it and go through the engine, remember on a rain day you are pumping incredible amounts of water through your engine! so I tiny bit combined with ethonal isn't going to hurt..... Anyway thats my fuel rant.

I noticed the out of the way gas stations say things such as "up to 10% ethanol" vs e85.

I've got a set up to test for how much ethanol is in the gas.
I,ve seen over 40% from a up to 10% puump.
Tested some E-85 came up at 55%
Now tell me your bike run's the same on every tank of gas.

If I'm right per pound of fuel it take's about
40% more ethanol to make the same BTU's as gasoline.