Premium or Regular......07 Attak

[jagabom]

I use regular gas with the 10% whatever kind df alcohol it is only because the manual says you can. Most guys I know don't.
Jim
08 APEX

 

[Darren Betker]

Lower octane is the answer here.....but just remember 87 has a shelf life of 3 months so either drain the tank in the fall and run it out or run 91 as your last tank and forget about it. Cheaper then a feul preservative.

 

[UP Michigan rider]

 

[Rich Kay]

Lower octane is the answer here.....but just remember 87 has a shelf life of 3 months so either drain the tank in the fall and run it out or run 91 as your last tank and forget about it. Cheaper then a feul preservative.

That will not work in most of the US..... our 91 or 92 still has ethanol in it... There are only a few places far and in between that have ethanol free premium fuel!

 

[UP Michigan rider]

Ethanol is a rip off!!

 

[Kevlar55]

Ethanol is a rip off!!

[/QUOTE


I haven't seen e-85 around here in the northeast.

 

[PolishMafiboss]

Higher octane gas is not really better gas. Higher octane is just more knock and ping resistant. No radical timing or compression on these motors so lower rating is better

Well one way higher octane could be better is with a couple brands, premium has less ethanol. Ethanol gives you worse MPG for example

Tork (and anyone else interested):

Premium has no less ethanol than 87 or 89 does. It’s still the 10-15% (whatever is max allowed by state.). In MI, it’s a mandated 10% “minimum” ethanol mix. 87 ethanol starts with 84/85 octane “base” (termed sub-grade) gas and then has 10-15% ethanol added. This brings it to 87 octane. Mid-grade is 55% sub-grade 85, add 35% “premium” (this varies by brand/refinery and can be anywhere from 89 to 93 octane), and finally, add your 10-15% ethanol to end up at you 89 octane mid-grade. Premium is no different. Starts off with premium (88-93 octane, most refineries are using 90 octane), dumb it back down a little with some 85 octane, then add ethanol to get back up to your desired octane (91-93). All of that calculating is done at the time the truck is loaded for delivery. The computer takes care of mixing everything based on your vendor selections, IE I tell it I want 3,500 gallons of BP 87 grade, it does the work.

The biggest difference between 87/89 and premium is the additive package injected into the product while loading. Premium fuels get a “premium” additive package. Some brands (BP, Sunoco and Shell come to mind) actually refine the premium fuel a little differently than the lower grades along with adding better additive packages.

Anyplace that is selling “rec fuel” is selling premium without the ethanol and a basic additive package.

After hauling gas around for 20+ years, you learn a thing or 2. Spend your $$$ however you want on fuels. Just be armed with good info.