For area that have 10% ethanol in their gas, its best to use 89 octane. There is less ethanol with higher octane. The 87 octane with ethanol really takes a toll on the float seal, just eats it up. Ethanol tends to have a little more water in the fuel over time. I know several people that use 93 or 94 octane for the mowers. That is over kill and 89 will be fine.
I'm asking the same question, just spent $500 (reasonable, too) replacing fuel pump, filter, sending unit due to ethanol deterioration. I know of a Shell station that has "Marine Gas" which is 89 octane non-ethanol, for the price of their 93 octane.
65% of 87 and 35% 93 to make 89 octane gas
93 octane is the first choice, but 87 is fine, if you can't find 93 octane. optimum performance is achieve by 93 octane.
I prefer to use 93 octane as it is an autobahn tuned vehicle and is a bit sluggish with the customary regular 87 octane (which normally contains 10% ethanol) Hope that helps. It works for me.
if it is stock compression 93 is fine..where did you find 98 octane anyway?
The 5.7L Hemi will run the same on 87 or 93 octane.
your car must have 93 octane.
93 octane works best.
93 octane
it has 93 percent isooctane
Vehicles should only be run in the recommended octane number (grade). A vehicle specified for 87 octane will not show appreciable or scientifically significant miles per gallon gains from running a "premium" 93-octane, for example. However, a vehicle requiring high octane may show performance lose and even damage from knocking when using incorrect grades. That being, the use of ethanol (and ethanol blends) results in less fuel economy as opposed to pure gasoline