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Old 08-25-2021, 05:47 PM #16
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Quote:
Originally Posted by BorotHex View Post
I run 91, stock tires at 35 psig instead of 32, and get 22+ mixed driving. I do not sit around idling ever though.

I deleted photos of my dash showing 23+ over the entire tank, but itís true. I do not drive slow, but for whatever reason I always get better than everyone else. I was a hypermiler when I was a teenager so maybe it stuck with me.
It has nothing to do with octane. It's your driving style or may be where you drive is at an higher elevation.
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Old 08-25-2021, 06:08 PM #17
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my Vtech kicks in way harder with 91
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Old 08-25-2021, 06:16 PM #18
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Originally Posted by 2021nightshade4x4 View Post
After so many tanks, will the vehicle ďattemptĒ to advance timing a little further?

Curious if there is any benefit to doing this or zero reason to try it.


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Only engines with higher compression ratios need higher octane gas; the 4Runner is not one of those. Thus there will be no difference in power, or fuel economy.

However, it is more important to use Top Tier Gas as recommended by Toyota and shown in the latest owners manuals (TOP TIER™ Gasoline Brands). Top tier gas has more cleaners in it than fuel that is not top tier, thus your engine will be cleaner, on the inside.
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Old 08-25-2021, 06:22 PM #19
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Quote:
Originally Posted by spartacus View Post
It has nothing to do with octane. It's your driving style or may be where you drive is at an higher elevation.

I did not say it was because of octane.

Thanks!
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Old 08-25-2021, 07:06 PM #20
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From a Toyota tech. Premium gas vs. Regular Whats really better for your car? - YouTube
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Old 08-25-2021, 07:42 PM #21
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Quote:
Originally Posted by fkheath View Post
Only engines with higher compression ratios need higher octane gas; the 4Runner is not one of those. Thus there will be no difference in power, or fuel economy.

However, it is more important to use Top Tier Gas as recommended by Toyota and shown in the latest owners manuals (TOP TIERô Gasoline Brands). Top tier gas has more cleaners in it than fuel that is not top tier, thus your engine will be cleaner, on the inside.
What is the compression? 8:1?
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Old 08-25-2021, 07:46 PM #22
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Old 08-25-2021, 07:50 PM #23
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It makes your wallet lighter or your bank account smaller, not much else.
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Old 08-25-2021, 08:10 PM #24
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What is the compression? 8:1?
Dual vvti 10.4.:1
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Old 08-25-2021, 08:44 PM #25
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I did about 7,500 miles over 6 months with 91 vs 87... no measurable MPG change except for the winter/summer blend.

18.8 average before 91 ~ 6 months (watching eco light like a hawk)
18.7 on 91
18.7 post 91 ~ 6 months (added TRD CAI)
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Old 08-25-2021, 08:52 PM #26
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You have less money for beer

This equates to 4 beers every tank.

Iíll stick with 87
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Old 08-25-2021, 09:41 PM #27
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At 87, I was getting 14.7mpg, after switching to Premium, I have gained 80hp and get 40mpg!

Just kidding, it doesn't make an f'ing difference. It's a 4Runner, it's horrible on gas and slow, what did you think you were buying?
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Old 08-25-2021, 09:50 PM #28
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i skip straight to jet fuel.......
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Old 08-25-2021, 10:50 PM #29
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I used 91 on a Honda Odyssey once thinking it would be better for towing and it it threw up an oxygen sensor code. Never did that again and the code never reappeared.
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Old 08-26-2021, 02:25 AM #30
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Quote:
Originally Posted by fkheath View Post
Only engines with higher compression ratios need higher octane gas; the 4Runner is not one of those. Thus there will be no difference in power, or fuel economy.

However, it is more important to use Top Tier Gas as recommended by Toyota and shown in the latest owners manuals (TOP TIERSo what exactly happens if you run Premium in a 4Runner? Gasoline Brands). Top tier gas has more cleaners in it than fuel that is not top tier, thus your engine will be cleaner, on the inside.

I see engines with 10.5 require premium fuel, some with 9.6 require mid, so how is the 1GR able to do 10.4:1 with just regular?


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