Regular unleaded vs Premium gas

[WildHorse]

I use aromatic C-3 equivalent or "green grade".

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[Smokey613]

It is a lot of fun for sure. If we could justify two vehicles it would be a permanent addition to the stable. If the back seats were actually usable then we might could keep it. I am in no hurry to get rid of it. I am NOT going to give it away to a low balling dealer so I think it will remain in the driveway for awhile.

 

[Loki-GT]

Exactly. Like I said above, I never understood why people spend $45000ish on a mustang GT which is a performance orientated vehicle just to cheap out on their gasoline they put in the car

Exactly, people state their Camry runs fine on it, great run 87 in it, this isn't a typical low compression engine, it's a 12:1 engine which is quite a bit and I plan on keeping it a while so it's going to get the good stuff. Lamborghini could do the same as Ford, their engines aren't higher compression (2019 Huracan is 12:7 so a little higher), they simply don't add all of the crap it takes to get their engines to run 87 but I'd lay odds if they did many people would only use 87.

 

[WildHorse]

Lamborghini

Pretty sure if you use 87 in a lamborghini you'll get a visit from some men in 3-piece suits sporting fedoras & carrying violin cases knocking at the trailer door...

 

[Andy13186]

e85...

 

[WildHorse]

e85...

I certainly wouldn't daily E85.. IIRC mustangs are only certified to E15.

 

[mustang5o]

I certainly wouldn't daily E85.. IIRC mustangs are only certified to E15.

But unlike the S197's we don't have to change fuel pump or injectors to run E85...correct?

 

[raptor17GT]

I believe UK uses a different measurement. The US numbers are the average of Research and Motor octane values.

i believe that to be the case, our 98 is about your 93 IIRC Premium fuel for me always

 

[WildHorse]

But unlike the S197's we don't have to change fuel pump or injectors to run E85...correct?

I have no idea. Pump E85 isn't available here other than in $700 55gal drums, so I never really looked into the fuel system side of it.

 

[2017GBGTPP]

I have no idea. Pump E85 isn't available here other than in $700 55gal drums, so I never really looked into the fuel system side of it.

E85 works fine in these cars, you just need to tune for it.

 

[WildHorse]

E85 works fine in these cars, you just need to tune for it.

Yes Sir, however Ford says a maximum of E15, must be a reason for that I would assume? Especially for a daily.

 

[2017GBGTPP]

Yes Sir, however Ford says a maximum of E15, must be a reason for that I would assume? Especially for a daily.

Because putting E85 in a stock mustang would cause it to run dangerously lean. Ford isn't going to add something in the specs saying it's possible to run E85 with a non-Ford aftermarket tune.

 

[BlackandBlue]

Yes Sir, however Ford says a maximum of E15, must be a reason for that I would assume? Especially for a daily.

Alcohol will soften/dry out some plastics over time especially with heat. From what I understand the chain guides can be softened/crazed over time from alcohol. I am sure there are other things the alcohol attacks as it dilutes in the oil over time.

Ethanol is rough stuff when combined with heat and time.

Engines are specially built to run flex fuel. And more than just from a tuning aspect.

 

[Smokey613]

I was wondering about the “freshness” of the higher octane fuels at local stations. I would think that the 93 is not refilled as often as 87. I guess this could cause the fuel to degrade slightly or more chance of contamination the longer it sits in the underground tank. Correct me if I am wrong but isn’t the mid grade just a blend of 87 and the highest octane available at a particular location?

 

[WildHorse]

Because putting E85 in a stock mustang would cause it to run dangerously lean. Ford isn't going to add something in the specs saying it's possible to run E85 with a non-Ford aftermarket tune.

I'm talking from a fuel system point of view, not tune. Can the fuel pump handle the added volume? What about the injectors?

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