Regular Or Ethyl ?

[06-3]

Has anyone experimented with fuel to see if mileage varied under the same driving conditions ? which it be Regular or Ethyl ? :corn:

 

[Dennis]

Unless your PCM is tuned specifically for the use of Hi-Octane, or normal 87 Octane, the opposite will not improve mileage..in fact, Hi-octane will lead to premature carbon fouling in the cylinder heads if the octane tables and timing hasn't been tuned for it..I had my PCM tuned for 89 octane for all weather driving and optimum performance range...Unless tuned for Hi-octane, it is a waste of your money.

 

[digglesworth]

Dennis, what happens if you happen to run 87 for whatever reason? Say you're on a road trip and 89 isn't an option at that moment.....

 

[06-3]

Dennis ,

what was the effect after your tune ? in a few weeks or sooner maybe , I will send my ecm away to pcm for tuning .

 

[Dennis]

Dennis, what happens if you happen to run 87 for whatever reason? Say you're on a road trip and 89 isn't an option at that moment.....

When I put in 87 octane by mistake one time The indication was some sluggishness, but not very noticable if at all and I was told that on really hot days there may be some minute predetonation if any..That is why if tuned for 89 octane, your PCM is operating in the middle of the Octane tables, which leaves more room for adjustment to higher or lower fuel grades.

 

[Dennis]

Dennis ,

what was the effect after your tune ? in a few weeks or sooner maybe , I will send my ecm away to pcm for tuning .

The effect was noticeable immediately..more pep, vigor and responsiveness.

 

[digglesworth]

Do you notice any difference between summer and winter gas blends?

 

[RamRod]

Winter gas sucks.... at least up here it does!!

 

[4speedfunk]

87 all day...every day.

 

[Bigunit]

87 octane for me too. I also replace the summer air in my tires with winter air at about this time of year. It seems to offset the oxygenated gas that Arizona requires gas retailers to sell during the winter months...jk of course.

Sent from my XT1080 using Tapataint

 

[06-3]

87 octane for me too. I also replace the summer air in my tires with winter air at about this time of year. It seems to offset the oxygenated gas that Arizona requires gas retailers to sell during the winter months...jk of course.

Sent from my XT1080 using Tapataint

:HA:

 

[Steve #1]

If you have an 06, it isn't Flex Fuel. You definitely want to run Regular.

 

[Big Mike]

87 octane for me too. I also replace the summer air in my tires with winter air at about this time of year. It seems to offset the oxygenated gas that Arizona requires gas retailers to sell during the winter months...jk of course.

Sent from my XT1080 using Tapataint

I drain my engine oil and replace with cooking oil for easier starts in the upstate NY winter..

Sent from my SAMSUNG-SGH-I747 using Tapatalk

 

[Gunner_45]

87 octane for me too. I also replace the summer air in my tires with winter air at about this time of year. It seems to offset the oxygenated gas that Arizona requires gas retailers to sell during the winter months...jk of course.

Sent from my XT1080 using Tapataint

When it comes to gas/hot air/heavy air.......I consider you an expert.

Just sayin'.

 

[digglesworth]

http://www.hummer4x4offroad.com/for...-the-H3-more-efficient!&highlight=gas+mileage

Not so much about fuel choices but I think more on a path you're trying to go down... Hummers will never be in the good gas mileage category...

 

[RamRod]

87 octane for me too. I also replace the summer air in my tires with winter air at about this time of year. It seems to offset the oxygenated gas that Arizona requires gas retailers to sell during the winter months...jk of course.

Sent from my XT1080 using Tapataint

Oh man I am so going to use that one, one of these days!

 

[High Five H2]

I always use 85 octane gas. I live way up high in the mountains of Utah. I have heard that the higher elevation makes it so you don't need higher octane. is that true, or should I use 87?

 

[digglesworth]

I would think its something with the thinner air.

 

[Dennis]

I always use 85 octane gas. I live way up high in the mountains of Utah. I have heard that the higher elevation makes it so you don't need higher octane. is that true, or should I use 87?

I've never seen 85 octane..hmmm..Makes sense to have it at higher eleveations..thinner air = less oxygen, then there would be less of a combustion affect and no need for higher octane to burn slower..As Lower octane burns faster (easier)

 

[Dennis]

If you have an 06, it isn't Flex Fuel. You definitely want to run Regular.

Flex-Fuel means; able to burn 100% gasoline or 85% ethanol mixed gasoline..nothing to do with Octane needs..Your ECM tune determines the Octane to use.

 

[Steve #1]

Has anyone experimented with fuel to see if mileage varied under the same driving conditions ? which it be Regular or Ethyl ? :corn:

Flex-Fuel means; able to burn 100% gasoline or 85% ethanol mixed gasoline..nothing to do with Octane needs..Your ECM tune determines the Octane to use.

Thanks Dennis, the OP's question was poorly worded and I took the liberty of assuming he was trying to ask about mileage differences in using Regular UNLEADED and Ethanol, AKA E85. In this cases, assuming an 06 H3 which is not designed to use E85, using E85 would damage the fuel system and fuel mileage would be considerably reduced.

To answer the question "Regular or Ethyl ?" well, they are the same thing. Regular (leaded) gasoline contains Ethyl (Tetraethyilead). Leaded gasoline has been banned from use on US roadways since the early 90s. Using it in an 06 H3 would damage the catalytic converter and mileage would be considerably reduced.

 

[Dennis]

Thanks Dennis, the OP's question was poorly worded and I took the liberty of assuming he was trying to ask about mileage differences in using Regular UNLEADED and Ethanol, AKA E85. In this cases, assuming an 06 H3 which is not designed to use E85, using E85 would damage the fuel system and fuel mileage would be considerably reduced.

To answer the question "Regular or Ethyl ?" well, they are the same thing. Regular (leaded) gasoline contains Ethyl (Tetraethyilead). Leaded gasoline has been banned from use on US roadways since the early 80s. Using it in an 06 H3 would damage the catalytic converter and mileage would be considerably reduced.

Yes indeed..I thought the Use of the word "Ethyl" was dated as well..but it was cool reading it again for old times sake..When I was pumping gas at a full service gas station when I was a teenager back in HS..Once an old lady asked me to fill-er up with the cheap spread..WTF is that I thought..then I realized she meant the Regular..

Anyway, I grew up and drove cars in a time when leaded gas and Sunoco 260 was like fine wine from heaven for us gearheads:horns:...sorry, I digress:shame:

 

[Steve #1]

Just noticed the typo in my last post. Leaded gas was banned in the early 90s not 80s. I'm old enough to remember the day I pulled my 67 Cougar in to the last service station that still sold leaded gas and found they were out.... and not getting any more. :sigh:

 

[Highatop]

Well here's one for you. I live in the mtns and have to travel to Alamosa Co, mostly farm country. But private owned gas stations still sell leaded and unleaded gas. I think...cause of all the old farm rigs.
As for E85, cars and trucks that can use flexfuel. Unless E85 is about $1 cheaper, it will cost you more money to run. We did the math some years ago w/ our Tahoe and when E85 was about a $1 cheaper. Not anymore, the oil companies make sure of that...