Oops! 87 Octane
#1
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I just returned home from a 10 day trip towing my travel trailer/caravan. My 2010 Ford F-150 V8 runs on 87 Octane. Well, the next day I got the big kitty out of the garage and took it out for a little run up a local canyon. But first I needed gas.
After many fill-ups on the truck, after I put the card in the slot I punched the 87 octane button on the pump. It was not until I was leaving the station that I realized what I had done. Nearly a full tank of 87 octane gas.
The result? I noticed nothing different. Apparently the computer/spark timing/variable cam timing setup prevented any pinging. I also noticed no loss of performance. Hmmmm.
What I have done since is to fill up with premium as soon as I get down 1/4 tank. Better safe than sorry.
Tom
After many fill-ups on the truck, after I put the card in the slot I punched the 87 octane button on the pump. It was not until I was leaving the station that I realized what I had done. Nearly a full tank of 87 octane gas.
The result? I noticed nothing different. Apparently the computer/spark timing/variable cam timing setup prevented any pinging. I also noticed no loss of performance. Hmmmm.
What I have done since is to fill up with premium as soon as I get down 1/4 tank. Better safe than sorry.
Tom
#3
Join Date: Oct 2009
Location: Perth Ontario Canada
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#4
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I run 87 octane exclusively in my '07 XK, and have consistently experienced better fuel economy when comparing back-to-back 87 octane vs. 91 octane.
I have had the same experience in an '05 Z06 Corvette; and an '07 BMW Z4.
My understanding is that 87 octane has more energy btu than 91. However, I add the caveat that if detonation occurs with 87 then ignition will be retarded and one will lose all the benefits of lower octane.
I have had the same experience in an '05 Z06 Corvette; and an '07 BMW Z4.
My understanding is that 87 octane has more energy btu than 91. However, I add the caveat that if detonation occurs with 87 then ignition will be retarded and one will lose all the benefits of lower octane.
#5
![Default](/forum/images/icons/icon1.gif)
I run 87 octane exclusively in my '07 XK, and have consistently experienced better fuel economy when comparing back-to-back 87 octane vs. 91 octane.
I have had the same experience in an '05 Z06 Corvette; and an '07 BMW Z4.
My understanding is that 87 octane has more energy btu than 91. However, I add the caveat that if detonation occurs with 87 then ignition will be retarded and one will lose all the benefits of lower octane.
I have had the same experience in an '05 Z06 Corvette; and an '07 BMW Z4.
My understanding is that 87 octane has more energy btu than 91. However, I add the caveat that if detonation occurs with 87 then ignition will be retarded and one will lose all the benefits of lower octane.
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