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95.5-2004 Tacomas & 96-2002 4Runners 4th gen pickups and 3rd gen 4Runners

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Old 03-22-2007, 02:48 PM   #1
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gas octane

Anyone find that switching from 87 octane to a higher octane gives them higher gas milelage. Right now I get 18 mph out of a 2.7 3rz-fe. I heard going to 89 octane or 93 might give me a couple more miles per gallon. Any insight?

thanks
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Old 03-22-2007, 02:51 PM   #2
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hasnt helped me yet, thinking Im going back to 87. However I havent done hardcore number tests.
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Old 03-22-2007, 02:54 PM   #3
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It's hard to say, but nothing wrong with a few tanks to see. I would suspect the mpg would do down a little bit because the specific energy content of higher octane gas is lower than lower octane gas (wierd, huh). Then again, depending on the engine, it's possible some engines (especially ones designed to run on higher octane gas, such as forced induction or high-compression) will tend to run a little more efficiently with higher octane gas, yielding a higher MPG rating.
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Old 03-22-2007, 03:00 PM   #4
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I just tried a tank of 89 up from 87. Idles smoother. I won't know the mileage change until I fill up, maybe tomorrow or Saturday.
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Old 03-22-2007, 03:02 PM   #5
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Using a higher octane thats not required doesnt do anything for your engine other than burn hole in your wallet and also creates more carbon becasue of the unburnt fuel.
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Old 03-22-2007, 03:05 PM   #6
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Quote:
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Using a higher octane thats not required doesnt do anything for your engine other than burn hole in your wallet...
This first part is true...

Quote:
Originally Posted by ARB1977 View Post
...and also creates more carbon becasue of the unburnt fuel.
...the second part, not so much. An engine will not run leaner/richer based on a specific octane gas. That's what an oxygen sensor is for.
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Old 03-22-2007, 03:07 PM   #7
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Anyone find that switching from 87 octane to a higher octane gives them higher gas milelage. Right now I get 18 mph out of a 2.7 3rz-fe. I heard going to 89 octane or 93 might give me a couple more miles per gallon. Any insight?

thanks
I found this to be true. My truck also runs better with the higher octane. It's kind of a trade-off... our gas prices are extremely high here. I try to throw the good stuff in alternating every few tanks.
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Old 03-22-2007, 03:19 PM   #8
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I run this stuff called FP60 every fill up. Use 1oz for every 5 gallons of fuel. It lubercates the entire full system. It comes in a gallon jug and you can get a 16oz measuring bottle as well.
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Old 03-22-2007, 03:50 PM   #9
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I get 23 mpg using 89octane where I used to get 19 with 87 octane. I actually got 370 miles on my last tank of gas. ALSO I noticed that my valves dont ping whenever I use 89 octane, which was the real reason I went up to 89.

Bruce
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Old 03-22-2007, 04:01 PM   #10
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edit. I meant MPG. Lol. I put mph. Surprised nobody roasted me on it yet
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Magnaflow Performance Muffler w/ dual exhaust
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Horsepower is how fast you hit the wall, torque is how far you take the wall with you
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Old 03-22-2007, 04:03 PM   #11
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Can a lack of backpressure cause a poor MPG? I got a Header and a magnaflow flow through muffler. could that allow it to breath TOO WELL?

Thanks
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1998 Toyota Tacoma
2.7 liter 4 cyl.
Pacesetter Header
Magnaflow Performance Muffler w/ dual exhaust
Smittybilt brushguard
2 KC Daylighters 150w each

Horsepower is how fast you hit the wall, torque is how far you take the wall with you
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Old 03-22-2007, 04:26 PM   #12
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Can a lack of backpressure cause a poor MPG? I got a Header and a magnaflow flow through muffler. could that allow it to breath TOO WELL?

Thanks
Low backpressure can cause a loss of low-end torque, which might in turn cause you to use the accelerator more to get up to speed and use more gas in the process.
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Old 03-22-2007, 04:26 PM
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