EPA MPG ratings out

[Leov36]

My understanding is that higher octane rating allows an engine to run safely under higher compression/load/etc.

MPG is a bonus, but I'd be concerned about the long-term stresses that running a lower octane rating might mean for engine longevity.

I'm not an engineer or expert but I guess what I'm trying to say that I will pay more for premium/93+ octane if it means that my engine will run better for longer & with less stress/wear/heat on components.

Just my $0.02

Yes I would definitely Not consider putting anything less than 91. If you want to roll with the big dogs at night you gotta soar with the eagles in the morning.

 

[D&Sadventure]

They actually have done multiple tests and found zero performance dropoffs from not running "recommended" premium.

On which one the Sierra 6.2 or the hurricane HO?

 

[MattH89]

On which one the Sierra 6.2 or the hurricane HO?

The Sierra. A HO turbo engine definitely requires premium. The 6.2 NA from GM "recommends" premium but all tests have shown only a 1% HP loss and 7% MPG loss using regular instead of premium. There's a theoretical long term reliability argument to be made, but not enough data to know either way.

 

[TheBarBack]

I've been putting premium in my raptor since taking ownership... just on the premise that I tow all the dang time. I average about 15mpg in that, so I expect almost no difference

 

[D&Sadventure]

The Sierra. A HO turbo engine definitely requires premium. The 6.2 NA from GM "recommends" premium but all tests have shown only a 1% HP loss and 7% MPG loss using regular instead of premium. There's a theoretical long term reliability argument to be made, but not enough data to know either way.

Today’s 93 octane price is approximately 3.49.9 a gallon so that 7% equates to 24 1/2 cents a gallon. 93 is only 30 cents more than 89 here so it almost pays for itself

 

[Leov36]

Does the epa test the truck with the beadlocks or the standard wheels?. The weight difference seems significant, but do you think it actually makes a difference on overall MPG?

 

[D&Sadventure]

I really don’t think the EPA actually tests the vehicle. The EPA figures are different than the factory figures. Of course I’m betting we are all going to have a wide range and figures too. We all live in different places. We all have different driving styles. I have personally seen everything from 5.4 to 14.3 mpg average on a TRX. I’m in and out of dealerships all day long and I have a habit of asking the tech if I see a TRX on their left to punch up what the average fuel economy is on it. On our jeep JLUR my wife gets about 16 .2 . I get about 19.7. With 35 inch tires.

 

[MattH89]

Today’s 93 octane price is approximately 3.49.9 a gallon so that 7% equates to 24 1/2 cents a gallon. 93 is only 30 cents more than 89 here so it almost pays for itself

Nice. Here it's like 3.49 vs 4.39 so not even close. Just depends where you are I guess.