What octane gas do you use? (The Mother thread)
Lead Lap
Joined: Oct 2013
Posts: 580
Likes: 4
From: North of Detroit
the E10 and E0 gas i definitly see a decrease in economy when using the michigan mandated 10%.
in ontario, Shell Vpower has 0% ethanol content, just allll gasoline.
Ethanol has a lower energy/mole value compared to gasoline, but also a higher octane rating (about 108 if i recall correctly). So you need more of it to achieve the same power output.
The stoich value for E85 is lower as well, somewhere around 9.5:1 vs 14.7:1. BIG difference there.
Guys make big power on E85 because it resists detonation well, but you almost have to double your injector and pump to keep up with the volume demand.
As for my scenario, i see about a 50km reduction of range in my foxbody when im running E10 vs E0. Same highway route, same speed.
And python your right-Ehtnaol is very corrosive for aluminum and some rubbers. I believe nitrile is ethanol resistant. It is also a much drier(less lubricating) fuel than gasoline.
in ontario, Shell Vpower has 0% ethanol content, just allll gasoline.
Ethanol has a lower energy/mole value compared to gasoline, but also a higher octane rating (about 108 if i recall correctly). So you need more of it to achieve the same power output.
The stoich value for E85 is lower as well, somewhere around 9.5:1 vs 14.7:1. BIG difference there.
Guys make big power on E85 because it resists detonation well, but you almost have to double your injector and pump to keep up with the volume demand.
As for my scenario, i see about a 50km reduction of range in my foxbody when im running E10 vs E0. Same highway route, same speed.
And python your right-Ehtnaol is very corrosive for aluminum and some rubbers. I believe nitrile is ethanol resistant. It is also a much drier(less lubricating) fuel than gasoline.
Last edited by Greg5OH; Jun 20, 2014 at 07:10 AM.
AAA Premium Fuel Research – Phase II
If you want some more reading on AAA"s findings here ya go:
http://publicaffairsresources.aaa.biz/download/9262/
http://publicaffairsresources.aaa.biz/download/9262/
Driver School Candidate
Joined: Aug 2018
Posts: 8
Likes: 0
From: NC
Another amazing MPG pic
Wow, that is a wide spread in mileage with different octanes. 28MPG is much higher than EPA estimate for highway driving.
I also tested mileage for regular and premium gas for the same stretch of highway for many months and found no difference between the two. I consistently got 24+-.5MPG (EPA estimated 23MPG).
I also tested mileage for regular and premium gas for the same stretch of highway for many months and found no difference between the two. I consistently got 24+-.5MPG (EPA estimated 23MPG).
Pit Crew
Joined: May 2018
Posts: 160
Likes: 16
From: Western Australia
Yeah, that seems a little too off the mark to me.
That was the average of the whole trip? Or just the average of say the last 2 Miles?
I live in Australia, so I gotta do a load of conversions to get that figure to make any sense to me, but after the conversions, thats just way too good for an Engine thats done 280K Miles and probably 20 or more years old. Thats far better than they advertised NEW.
In Australia, we dont to MPG, we do L/100 Km (Liters per 100 Km)
So thats about 7.6 L/100KM. That about what you could expect out of a 2.5L to 3L NEW engine with VVT and CVT
My 89 LS400 (Actually a Celsior) gets about 5 L/100Km on a run. About 4 or less around town.
Was this pic taken after you had just done a long down hill stretch? That might account for it.
Just for Interest sake, the list of differences from America to Australia regarding fuel continues.
* Our gallon (when we do use it) is the British gallon that's 4.54L. The US Gallon is 3.78L.
* We calculate Octane differently, Australia use the RON rating, USA uses AKI rating. This results in about a 5% difference (ie US 93% is about AU 98%).
* and we use Km (Kilometres) instead of Miles.
And if you want to take it to the extreme, Australia uses bitumen with blue metal giving a rougher but more grippe surface. America (to the best of my knowledge) uses cement which lasts better, offers less rolling resistance but less grip. I'm not quite sure, but cement for roads may only be in cities. Anyway, providing that's accurate (never been to the USA) that would mean USA cars might get a SLIGHTLY better millage than we do here in Australia, but I think that more translates into tires not lasting as long in Australia.
Anyway, starting to get off topic.
That was the average of the whole trip? Or just the average of say the last 2 Miles?
I live in Australia, so I gotta do a load of conversions to get that figure to make any sense to me, but after the conversions, thats just way too good for an Engine thats done 280K Miles and probably 20 or more years old. Thats far better than they advertised NEW.
In Australia, we dont to MPG, we do L/100 Km (Liters per 100 Km)
So thats about 7.6 L/100KM. That about what you could expect out of a 2.5L to 3L NEW engine with VVT and CVT
My 89 LS400 (Actually a Celsior) gets about 5 L/100Km on a run. About 4 or less around town.
Was this pic taken after you had just done a long down hill stretch? That might account for it.
Just for Interest sake, the list of differences from America to Australia regarding fuel continues.
* Our gallon (when we do use it) is the British gallon that's 4.54L. The US Gallon is 3.78L.
* We calculate Octane differently, Australia use the RON rating, USA uses AKI rating. This results in about a 5% difference (ie US 93% is about AU 98%).
* and we use Km (Kilometres) instead of Miles.
And if you want to take it to the extreme, Australia uses bitumen with blue metal giving a rougher but more grippe surface. America (to the best of my knowledge) uses cement which lasts better, offers less rolling resistance but less grip. I'm not quite sure, but cement for roads may only be in cities. Anyway, providing that's accurate (never been to the USA) that would mean USA cars might get a SLIGHTLY better millage than we do here in Australia, but I think that more translates into tires not lasting as long in Australia.
Anyway, starting to get off topic.
Last edited by PhilipMidd; Aug 15, 2018 at 10:01 PM. Reason: Corrected small omission to add context
Driver School Candidate
Joined: Aug 2018
Posts: 8
Likes: 0
From: NC
Me too.. 89 all the time.
I have had my '98 LS for just over 2 years. I have always run Plus(89) gas in it and I can't tell a difference from the couple of times I actually used Premium(91). I have actually used Regular(87) a time or two with no ill effects but was worried it might cause other problems over time (like carbon build-up and such.)
I also have not noticed any difference in MPG's. I get 20-22 in strictly city driving and I recently got 32 MPG on an Interstate trip where I didn't need the air on.
There seems to be a *widely* varying opinion on this topic.
I also have not noticed any difference in MPG's. I get 20-22 in strictly city driving and I recently got 32 MPG on an Interstate trip where I didn't need the air on.
There seems to be a *widely* varying opinion on this topic.
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