higher is hotter.. well read my post above explains higher octane fuels.

 

The flashpoint is lower, but i dont think it burns any hotter than regular gas

After this tank im going back to the good ole 89 and see if she still acts the same, if not she is getting the high octane treatment, Im getting a tuner soon so i should get used to purchasing the expensive stuff anyways

(EDIT. Flashpoint is higher not lower)

 

i was actually told by a performance shop that the gas with a small percentage of ethanol is actually better performance wise (he explained it all but i dont remember) but the ethanol has a chance of freezing under extremely cold temps (very unlikely tho)

ive also experience better mpg on a long trip with mid grade

 

If you got that much of an performance increase you were getting a lot of knock retard with whatever octane you were using. Why you're getting that much KR on a stock tune I dunno..

 

Then if higher burns hotter someone needs to go back to shop class.. when i got my ase certification you had to explain the octane's. from my pop to shop class to ASE ive always known higher is hotter and great explanation ben kudo's

 

i've used 91-92 octane for over 100K miles now and never changed my plugs and never had anything go wrong with the engine...but i also have a bully dog pup so.....I dunno

 

Your both wrong. High octane gas is used in engines with high compression and advanced timing due to the way the gas burns, 87 burns in more of quick explosion and 93+ burns in more of a wave ie. a slower expansion, therefore producing power the ENTIRE stroke of the piston as opposed to a quick burst and relying on momentum to carry the piston thru the power stroke. This is why race engines use high octane, octane is a gasoline's rated ability to resist pre-detonation, so your can use a higher compression ratio and more advanced timing producing more power.

You may notice an improvement in power due to regularly using poor gas and not noticing minor pinging. Pinging is due to having the timing advanced to much for the octane burned causing the expansion phase before the piston reaches TDC.

 

Okay, way too much bad info here. There's much more to an octane rating than some can even try to comprehend. Most will just get lost behind the whole physics involved.

However to answer your question and keep things simple, using bad 87octane gas could have been casuing your truck to pull out timing because of spark knock detected. Going from bad gas to good gas could make your truck feel entirely like new. So by putting in 93octane, that gave you the edge to stay above petty grade gasoline that was otherwise harming your engine.

 

http://en.wikipedia.org/wiki/Octane_rating

Bad info? BTW I just looked this up right now to see if I was f---ed up with my knowledge, or I failed at explaining it correctly. Also gasoline's flash point is -40*F, diesel is 143*F and ethanol is 55*F. I just corrected myself on that one, 5 minutes ago I could've sworn gas was -45.

 

Me and my wife used to run Sohio and then after the name change BP stations.. 93 will not gum up or sludge up your engine, if it is running better on 93, it prefers 93... What I would do, is run 93 for a couple tank fulls, then switch down to mid grade 89 octane.. because truthfully, all it is ESPECIALLY at BP is 93 and 87 mixed together, giving it a "89" rating.. It really isn't consistent 89 and is usually more 93 than 87....

JimK