Hey guys, got quick question about octane ratings. In the short time Ive had my Discos, Ive ran non-ethanol 91 because it’s been the highest octane available. I just had a new 7-11 built near my house, thank Goodness, and it has a pump with non-ethanol 93 octane.This is very rare in my state. So my question is...is there any benefit from running 93? I dont mind paying the higher price. Just curious.

 

i don't know if you will see or feel a difference using the non-ethanol 93 octane fuel, but that is what these engines were made to run on. it's only a two point difference from what you have been using.

that being said, i would love to be able to find ethanol free 93 octane fuel in Saint Louis.

 

I think 91 is more than sufficient
i sometimes run 87 a few tanks and switch back to 91. I see no difference in mpg or performance

 

I run the mid grade 89 oct all the time.....no problem at all. The engine is able to compensate for the lower oct. Yes you lose alittle power but I dont notice any really.

 

Luckily....we have no shortage of non-ethanol fuel around here in 87-89-91 octane ratings. Which is all I run in all my vehicles...even the lawnmower. But the non-ethanol 93 is a real rare bird for us. I might try a few tanks for giggles.

 

The performance difference in 93 non-ethanol can be found in tuned high performance engines. On our trucks, you will see no impact between 91 and 93 IMO.

Also, I am conflicted or rather weary of using 7-11 gas regardless of grade. The lack of detergents is what concerns me but, maybe being non-ethanol it is a moot point.

 

I can’t find fuel anywhere around here without 10% ethanol. I normally do 87, 89, and sometimes 93 octane. I just did a seafoam treatment on my Kalahari & it smoked maybe 5-10min! I’d say my engine is in darn good shape & that’s with 235,000 miles on it!

When I did a seafoam treatment on that 02 Westminster it smoked for 35min easy!! Older dizzy powered non OBDII LR’s were the picky ones. Sure you’ll get the max HP with 93, but as mentioned above it will compensate.

 

It depends on your elevation. If you are in Florida then go higher. If you are in Denver, run the 87 and call it good.

 

Kind of a wash as higher humidity = lower oct needs. Fla as we know has high humidly while Denver is typically low. We may be over thinking this at this point ....lol

 

It is more/less complicated you actually only need 89, the European system of measurement is different than North America just to make things fun.

The problem with fuel for these is the definition of premium, North America and Europe use a different method. The handbook says 95 octane - BUT that is based on the European method, it works out to 91 North American, 89 would likely be fine 87 not so much.

http://www.pencilgeek.org/2009/05/oc...nversions.html

Mine loves the ethanol free Shell V Power 91 but with the insane gas prices here it hurts to fill her up