On Sun, 24 Jun 2012 10:19:06 -0500, Steve Barker
wrote:

On 6/23/2012 8:52 PM, Duesenberg wrote:
On 6/23/2012 9:00 PM, Steve Barker wrote:
On 6/23/2012 7:32 PM, Duesenberg wrote:
On 6/23/2012 7:12 PM, Tony Hwang wrote:


Jack Legg wrote:
http://www.tampabay.com/news/busines...epairs/1235927






"Spivey recommends using gasoline with an 89 or 93 octane rating, if
you
can afford it. The fuel is slicker, which means it won't hang
around on
your engine valves and other internal parts, eating away at the
rubber."

Is this true?

Hi,
First, what is Octane value? Why 89 or 93? 91 won't do? What kinda talk
is that? I use Shell 91 always, some times 94 blended with Ethanol.
Owner's manual always mention about proper gas to use for the engine.


Using too much ethanol in a small engine might burn the engine out.
That's what a chain saw repairman for an authorized Stihl dealer and
repair centre told me. He said if you can't avoid ethanol based
gasoline, get the highest octane available for your small engine because
it'll help cut down on pre-ignition



that's bull**** also.


Why's that?


Ethanol actually runs cooler, thus the reason for less gas mileage out
of it than with gasoline. Ethanol raises the octane rating. The worst
thing about ethanol is the fact that it absorbs water (after a great
period of time) and it's effect on rubber over a great period of time.

Ethanol raises the octane rating *because* it burns cooler. Modern
(automobile) fuel systems are sealed so there isn't a lot of water to be
absorbed. The fuel delivery chain has been upgraded over the last few decades
so water isn't an issue there, either. Ethanol won't harm the "rubbers" used
in fuel systems, though methanol will. The problem with ethanol is that it
*does* burn cooler so has less energy content (lowers gas mileage).