millhouse
Well-Known Member
- Joined
- Jun 27, 2016
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- Simpsonville SC
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- 2016 Ruby Red GT PP
87 octane shows a 2.3% fuel economy loss (less than 0.5mpg). 93 octane fuel is 25% more expensive than 87. We have been through this already.Cool, so we have come to the conclusion that 87 makes less power, as backed up by forum member dynos, and the AAA doc.
Now, what about MPG on 87?
Forum members state a loss of MPG with 87 as does the AAA doc. The percentage of MPG loss does not outpace the increased in cost per gallon however (regionally that may differ - your results may vary).
So, do you want cheaper gas with less power and MPG or do you want to pay the premium for premium (ba dum tss) and have the optimum MPG and power?
I personally will take the better power AND mpg.. its a no brainer.
Honestly, it doesn't bother me that anyone choses 93 octane fuel. It bothers me when people think there is a significant performance or MPG difference without any spec of proof, specifically when there is an actual scientific test that proves otherwise.Thanks Millhouse. It seems the midrange is more a factor than peak. Also, not sure how much is applicable to the new gen Coyote. Also, the data provided shows premium to be 91....not 93 that Ford now requires for full power.
Just one other totally antecdotal and one-off experience: I always ran 93 in my 2016. However, I found that by mixing 2 gallons of 102 race fuel to 5 gallons of 93, my car was a full tenth quicker in the quarter. On 100% race fuel, it was actually a bit slower. The PCM was able to adjust to and make use of the roughly 96 octane mix but not to the 102. I haven't tried fuel mixtures in my 2018 since my local source for 102 no longer exists.
It's also funny that nearly every single person would laugh at any individual that spends $1500 on a 10hp modification, but that is precisely what it costs many over 5-7 years of premium fuel. Likewise, people pull the "but you bought a sports car" claim and act like $500 a year doesn't matter, but those same people would switch insurance companies in a second if it saved them $500 per year.
Anyways, I have thrown all of the data out there to squash the crazy horsepower and fuel economy claims. It's up to everyone else to decide if the horsepower is worth it to them.
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