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Old 12-12-2002, 09:14 PM
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Default 87 Octane Vs 93 Octane, what's the big deal?

I read my owners manual and Toyota recommends 87 octane or higher unleaded gasoline. The Lexus version of our motor requires 91 octane fuel. My truck seems to run better on 93 than it does on 87. With 87 Octane I can hear it momentarily ping on hard acceleration and my gas mileage goes down slightly.

Anyway I usually put 22 gallons of fuel into my tank. Regular costs $1.47 and the 93 octane costs $1.59 here in Massachusetts. The difference in price when filling my tank with 87 Vs 93 octane gas is $2.64. I can't believe people make a big deal over such a little difference in price when they drive a 20-30 thousand dollar vehicle. Don’t forget you get a few more miles out of the higher octane gas because the computer isn’t retarding the timing to reduce the pre-ignition or detonation, which reduces fuel economy.
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Old 12-12-2002, 09:43 PM
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Here in western Washington the price difference is 20¢ to 30¢ per gallon--and 91 or 92 is the best available.

I don't think that the momentary ping is a problem. A very slight ping might be the correct spark timing and no harm to the engine.


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Old 12-12-2002, 10:33 PM
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I've never heard any type of pinging with the 87 octane stuff. I replaced my plugs at 15k (have 18k now) and use the stock denso plugs gapped at .032. Could there be some other reason you're hearing the ping such as an O2 sensor going bad? Just a thought. I'll give a higher octane gas a try my next tank, see what happens. With a low compression head, I wouldn't think that anything higher than 87 would be necessary.
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Old 12-13-2002, 11:47 AM
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Out here in CA, the price difference can also be $0.20-0.30/gal. between 87 and 91. Unscientifically I once tried a couple of tanks of regular, a couple of tanks of midgrade, and a couple of tanks of super, and my mileage went up with midgrade, and down with super. Of course this wasn't a very controlled experiment, as the weather may have changed, my driving style may have changed, etc.
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Old 12-13-2002, 01:31 PM
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I fill up at least once a week. Lets be conservative and say I use 20 gallons/week, at $.20 more/gal for 91 octane (we don't have 93 around here). That's an extra $4/week multiply that by 52 weeks = about $208 more per year in gas. I'll save that $200 for extra toys for the Tundra.
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Old 12-13-2002, 05:23 PM
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Quote:
Originally posted by Sumo99
I fill up at least once a week. Lets be conservative and say I use 20 gallons/week, at $.20 more/gal for 91 octane (we don't have 93 around here). That's an extra $4/week multiply that by 52 weeks = about $208 more per year in gas. I'll save that $200 for extra toys for the Tundra.
Let’s say I get 25 more miles per a week because I use the super instead of the cheap stuff. If I drive 52 weeks a year I would travel 1300 more miles and save 76 gallons of gas or $121.58. So the extra cost of the super really costs me about $80 a year, that’s $1.54 per a week!

With a 9.6-1 compression ratio the Tundra isn't exactly a low compression engine either. I don't hear any ping what so ever with the 93 octane even momentarily.
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stock exhaust
Formerly Modified JBA headers now SSautochrome headers temporarily
TRD LSD
Extang lift off tonneau
Hankook DynaPro AS RH03
stock air filter & box


220 HP @ 4800 RPM
302 TQ @ 3400 RPM
Run With Spintech Sportsman XL muffler, stock air filter, and JBA headers

208 HP @ 4800 RPM
285 TQ @ 3400 RPM
Run With Spintech Sportsman XL muffler, TRD air filter, and stock manifolds

204 HP @ 4800 RPM
271 TQ @ 3400 RPM
Bone stock

Quarter mile 15.526 @ 87.17 mph bone stock in 40-degree weather 2WD SR5 V8.
Quarter mile 15.389 @ 88.66 mph modified in 60-degree weather 2WD SR5 V8.


0-60 IN 6.88 seconds on G-tech
Dyno run results click here
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Old 12-13-2002, 05:45 PM
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Default 91 Octane

I've always filled up with premium gas (never at Texaco). 24 gallons at $1.66 this morning. Gets expensive but piece of mind for me.
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