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Mustang Technical Discussion > Pre 1973 > Stinky 289 > Community Forums > Mustang Forum Australia - Mustang Tech

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hybrid
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A mate of mine years ago kept log books religiously in a laser he drove, and he also used 98 because it gave him better mileage to the point that it ended up the cheapest option. It only needs to be around 10% or so better to make it worthwhile.

The problem with ethanol (and pretty much any alcohol) is that although you can make more power with it in the end (and it keeps intake temps down), you actually have to use more of it.

When dad was racing bikes, from memory when you went from petrol to methanol, you pretty much doubled the jet sizes in your carb.

So it's not surprising that with Ethanol making up 10% of E10, that 10% Ethanol is going to make less power than the same amount of petrol.

I would guess that it's also why we don't see the Ethanol content go any higher at normal pumps. It would start screwing with cars that are tuned for petrol and don't have flex-fuel tunes.


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StephenSLR
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nassi wrote
Earlier this year I read of similar results. Three "identical test cars", were filled with 98, 95 and what ever the lowest grade unleaded is. 98 worked out to be the more economical then the lowest grade followed, the 95 retuned the worst result.
I guess it comes down to whatever you are comfortable with.


What were the identical test cars; 60's Mustangs or new model cars with O2 sensors and the latest EFI?

s


Listen to my band here: www.reverbnation.com/LYCANTHIA

Last edited by StephenSLR on Thu Mar 24, 2016 1:15 pm; edited 4 times in total

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nassi
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StephenSLR wrote
nassi wrote
Earlier this year I read of similar results. Three "identical test cars", were filled with 98, 95 and what ever the lowest grade unleaded is. 98 worked out to be the more economical then the lowest grade followed, the 95 retuned the worst result.
I guess it comes down to whatever you are comfortable with.


What were the identical test cars; 60's Mustangs or new model cars with O2 sensors and the latest EFI?

s


New stuff. Hyundai's from memory.


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StephenSLR
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nassi wrote
New stuff. Hyundai's from memory.


Who conducted the test? I saw something similar on the Aus. Top Gear; three guys driving three cars. One of the hosts threw $20 out the window; comparing it to using 98. These type of tests aren't really scientific; unless there was drastic differences, you couldn't really be sure.

If you used the same car, the same circuit all using the same fuel and had 3 different guys driving; you'd get 3 different results.

s


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nassi
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StephenSLR wrote
nassi wrote
New stuff. Hyundai's from memory.


Who conducted the test? I saw something similar on the Aus. Top Gear; three guys driving three cars. One of the hosts threw $20 out the window; comparing it to using 98. These type of tests aren't really scientific; unless there was drastic differences, you couldn't really be sure.

If you used the same car, the same circuit all using the same fuel and had 3 different guys driving; you'd get 3 different results.

s

It wasn't quite that frivolous.... I tried to look it up but got side tracked, so I will have to try again.


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xpconnor
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I remember reading about a few of these tests. I think one of the better ones was done by one of the car mags like wheels or something. It found that the cheapest fuel per kilometre was 98 octane. Actually come to think about it they tested a diesel as well (obviously it was better then all the petrol engines) so maybe it was done in Mondeo's or something like that.


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Pinto-Pete
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For what it's worth super used to be available with an octane rating of 120....


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ants
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"I would guess that it's also why we don't see the Ethanol content go any higher at normal pumps. It would start screwing with cars that are tuned for petrol and don't have flex-fuel tunes."

A few years ago a company in Newcastle took E10 fuel samples from 12 servos scattered around Newastle. When they tested the fuel the Ethanol ranged anywhere from 8% up to as much as 40%.
This explained why we would get customers coming in wth their car running like shit and when we suggest they try a different 98 they tell us that they've beeen using E10 for ages without a problem. We don't recommend E10 to anyone unlees the car has flex fuel as we don't believe the E10 is consistent.


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StephenSLR
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xpconnor wrote
I think one of the better ones was done by one of the car mags like wheels or something. It found that the cheapest fuel per kilometre was 98 octane.

Yeah that was a selling point when it first came here.

Pinto-Pete wrote
For what it's worth super used to be available with an octane rating of 120....


Is that in the USA? They have a different octane scale for some reason.

s


Listen to my band here: www.reverbnation.com/LYCANTHIA

Last edited by StephenSLR on Fri Mar 25, 2016 2:56 pm; edited 2 times in total

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lukep6470
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OK time to report back.

I've now put 1 and 3/4 tanks of regular unleaded through the motor and it smells a hell of a lot better. I'm getting 13l/100kms on country roads.

The only down side is pinking under load at low revs (With the 8 stack you don't move the throttle much around town so the AOD doesn't kick back as readily). Really annoying through traffic calming on a steep hill.

I'll try a couple of tanks of 98 next.


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xpconnor
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Do you always use the same type of fuel, eg shell, bp, Mobil? Maybe the 98 from a different manufacturer won't smell as much.


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lukep6470
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I use BP as it is closest to me.

I was running 95 and that was causing the stink.

Regular unleaded is better but pinks/pings.

So now I will try 98.


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boofhead
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I will put money on it that 98 will 100% fine.


I will someday think of something clever to say.

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ozbilt
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98 BP in Mrsozbilt's Mach in Aust. In the USA it was always Chevron premium fuel.


Kerry

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