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Old 02-12-2021, 08:36 PM #16
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Here in CO, 85 is the regular grade with up to 10% ethanol.
Been using it in my '08 V6 for 11 years with no issues, even towing and jumping over 13k mountain passed. I put high priority on quality fluids.
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Old 02-12-2021, 09:39 PM #17
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Definitely not.
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Old 02-13-2021, 01:23 PM #18
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I also used the 85 octane trash CO fuel in many of my trucks for years with no ill effect.
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Old 02-14-2021, 12:33 PM #19
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I use premium while towing
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Old 04-06-2021, 09:43 AM #20
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no real benefits...

however

being an old racer, i know that higher octane gas runs/burns better/hotter, and that gives any engine a tad more power. researching it in the 4runners (5th Gens), i know using regular gives us about 270hp...but using 93 octane gives us roughly 300hp.

so for me, i only uses high octane gas when im going to be towing something, like my motorcycle trailer.

but under any other normal use...all gas octane levels are mandated by regulations to have the same chemical and cleaning benefits.

and as has been said...our truck engines are built to use 87 octane gas...and that is high-priced enough as it is...
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Old 04-06-2021, 09:59 AM #21
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Yeah, as a mechanic & engine builder, your 270hp on 87 octane isn't going to magically produce 300hp going to 93 octane. The higher octane helps prevent detonation, allowing higher compression ratios and more aggressive valve timing... which is where you get your power. You're going to see a negligible improvement in your truck engine.
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Old 04-09-2021, 04:39 PM #22
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Quote:
Originally Posted by CajunMikeR View Post
Yeah, as a mechanic & engine builder, your 270hp on 87 octane isn't going to magically produce 300hp going to 93 octane. The higher octane helps prevent detonation, allowing higher compression ratios and more aggressive valve timing... which is where you get your power. You're going to see a negligible improvement in your truck engine.
The original 1GR-FE was designed to run on 91+ octane fuel. At 87 octane, the current engine is rated for 270 hp; at 91+ octane, the engine is rated for 285 hp. When you run lower octane, the ECU retards the timing and when you run higher octane it advances the timing.
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Old 04-10-2021, 12:06 PM #23
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Maybe placebo, maybe not... ours seems to run a little smoother and act a bit "peppier" on 89 vs 87. I didn't notice any further benefit when trying 91, so have stuck with running 89.

Try different octanes out. It you notice one seems to make your specific truck happier stick with it. Otherwise you can just go back to 87. Overall cash investment for this experiment is pretty low.
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Old 04-17-2021, 02:49 PM #24
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Split the difference and go mid grade
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Old 04-21-2021, 03:42 AM #25
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I'd say no, premium fuel is only meant for engines designed for it.npretty sure the 4Runner is designed for standard fuel.
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Old 04-30-2021, 12:34 AM #26
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Old 04-30-2021, 10:10 AM #27
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Regular all day.


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Old 07-04-2021, 10:21 AM #28
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Thank you all for your input.
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