What Grade of Gas are you using?

[Lou Hamilton]

The real question is why doesn't this "survey" ask about 87 octane? It says less than 87 or 88-89, etc. In my area 87 is an option.

I took it as less than or equal to 87, which is why I chose that option.

 

[Gumby]

So much meta trolling....keep it up boys!

 

[Plati]

So much meta trolling....keep it up boys!

sorry, really … just had to do this!

 

[Teasip]

Regular.

 

[Boose]

Premium. my local Costco has their premium at .20 over regular 2.79 vs. 2.59. The increased economy on the highway pays for it.

 

[rjdelp7]

The Ford Mustang GT 5.0 manual recommends 91 or higher for maximum performance. It will run with reduced performance on 87. Ford cleverly re-worded the Expedition manual. Basically, use 91 or higher for towing. In other words, it makes less power than advertised power on 87 octane.

 

[LokiWolf]

The Ford Mustang GT 5.0 manual recommends 91 or higher for maximum performance. It will run with reduced performance on 87. Ford cleverly re-worded the Expedition manual. Basically, use 91 or higher for towing. In other words, it makes less power than advertised power on 87 octane.

Thanks for stating again what several of us said A LONG time ago.


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[Fozzy]

The crap we have in Utah.


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[EdWeg]

Has anyone ever seen any 'measured' and 'recorded' studies showing output comparisons between which grade you use?

 

[LokiWolf]

Has anyone ever seen any 'measured' and 'recorded' studies showing output comparisons between which grade you use?

YES! Posted above!

Car & Driver did an article and it included a 150 with the 2nd Gen 3.5.

Also, I have done A LOT of logging. You can watch the motor pull timing, which means less boost, and less power when running lower Octane fuel.

Even on 93 it pulls timing under extended heavy load, high ambient temps, or when the intake and everything gets heat soaked.


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