91 or 93 Octane?

[CoronaRaptor]

Who mentioned race fuel? These engines are designed for 93 octane, running anything less results in reduced power and fuel economy.

Even on my Gen 1 I find that I get an extra 2mpg highway when I run 91 instead of 87. It costs more than it's worth but in the end it runs so smooth in the mountains around here with the higher octane. In the city I don't find any benefit.

 

[FordTechOne]

Even on my Gen 1 I find that I get an extra 2mpg highway when I run 91 instead of 87. It costs more than it's worth but in the end it runs so smooth in the mountains around here with the higher octane. In the city I don't find any benefit.

Makes sense. Gen 1 was rated 401HP on 87 or 411 on 91 octane, so the engine calibration is definitely able to take advantage of the higher octane.

 

[MRV99]

I run my own blend have a 330 gal tank with non ethanol and av gas 50/50 for 94 octane HUGE difference

Ethanol has less energy per volume so by removing ethanol you will get better mileage

 

[Kernel_Panic]

Would run 93 or 94 if I could, but stuck with 91 in Arizona. Something I never understood is how and why the oil companies and refineries would want to make two (or 3) different premium grade gasolines. Some neighboring states have 93 for the same or lower price. Or is it possible that 91 and 93 are the same, just marketed differently based on specific states requirements and regulations? You’d think it would be more cost effective to just produce one premium gasoline.

From speaking to a gas station attendant here in Canada, his station has 3 grades but only 2 tanks (87 and 91). 89 is apparently a mixture of the two. I'd imagine that stations that have 93 or 94 mix that with the 87 to get the grades in between.

 

[Tomhorn]

Engine adjusts for ping and knock 87 is fine if you drive like an f150 but at higher speeds kicking it down to accelerate major difference and in sport mode gigantic difference baja mode cant even explain it plus under reg 2 wheel i avg 20-21 mpg do what floats your boat i live on hardpack south east AZ and the roads around the ranch i can hit speeds of 110 in baja mode and theres a gigantic difference in octane in that mode ford did an unbelievable job

 

[Medic 6]

Have been running 93 since my complementary first tank ran out when I bought it new. The first tank was 87 octane.

 

[RPG9]

Is Premium Gas Worth It? We Test High Octane on 4 Popular Vehicles

We tested higher octane fuel than manufacturers require on the Honda CR-V, BMW M5, Ford F-150, and Dodge Charger to see if it impacted acceleration or MPG.

www.caranddriver.com

 

[Big Smitty]

93. I went west pulling a trailer and got 4mpg less with 91

 

[Grayson]

I use 93 octane in everything because I enjoy expensive trips.

 

[Jdselig]

Here is my question.. we have primarily 91 here. And I can easily get this WITHOUT ethanol. Or I can get 93 octane from one station here but it HAS 10% ethanol. What is better? The higher octane but with ethanol or the slightly lower octane with no ethanol.