Fj Can Use Regular Gas... - Page 2 - Toyota FJ Cruiser Forum
Dealer Negotiations/Test Driving This area is for purchasing help, dealer negotations as well as test driving impressions.

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post #11 of 104 (permalink) Old 05-22-2006, 07:23 AM
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Re: Fj Can Use Regular Gas...

For what it's worth my salesman told me the same thing... that it used standard 87 octane. The dealership even FILLED IT UP with 87 octane, and it seemed to knock and ping when idling in my garage (in Texas, probably around 650ft here) so I've used Premium ever since... but it still p!sses me off that they do this crap.

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post #12 of 104 (permalink) Old 05-22-2006, 07:24 AM
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Re: Fj Can Use Regular Gas...

Quote:
JLam previously said:
Let's say regular costs $3.37/ gallon. $3.37/gallon x 2 fillups per week x 52 weeks per year = $5257/year for gas.

Say premium costs $3.57/gallon. $3.57/gallon x 2 fillups per week x 52 weeks per year = 5569/year for gas.

So if you use regular instead of premium, you save a whopping $312 per year, or $6 per week. Anyone who can afford to pay $25-30K on a car can afford an extra 6 bucks per week. If you can't, then you shouldn't be driving a $25-30K car, IMO.

I know people go back and forth on the octane debate, but I figure that Toyota's engineers are a hell of a lot smarter than I am, and they put a lot of thought into figuring out what gas to reccommend.

I'm willing to drop the extra 6 bucks per week to run the good stuff.
Well said!

And I hate folks who drive out of their way to find a cheaper gas station. We spend so much money on crap but lots of folks pinch when it comes to gas. Does not make sense.

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post #13 of 104 (permalink) Old 05-22-2006, 07:31 AM
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Re: Fj Can Use Regular Gas...

Do the electronics record when the knock sencors adjust to burn lower grade fuel? and can Toyota pull that data out and use it to screw with you and your warranty?
I'm going to keep running premium in mine. The cost difference is small unless you're doing a whole bunch of driving.
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post #14 of 104 (permalink) Old 05-22-2006, 08:46 AM
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Re: Fj Can Use Regular Gas...

Quote:
rick_reno previously said:
Do the electronics record when the knock sencors adjust to burn lower grade fuel? and can Toyota pull that data out and use it to screw with you and your warranty?
I'm going to keep running premium in mine. The cost difference is small unless you're doing a whole bunch of driving.
Toyota issued a bulletin a few weeks back stating that the words "Use Premium Fuel Only", or something to that effect, were incorrect. You can use regular 87 octane fuel, but the FJ mileage estimates are based on 91 octane fuel. Knock sensors adjust the engine. Low octane has a tendency to ignite the fuel while the piston is still in its compression stroke, so the sensors retard the spark to compensate. This amount of spark retarding is slightly less efficient than design with 91 octane fuel. The amount of spark retarding occurs most when the engine is under heavy load (climbing a steep high, hard acceleration, or towing). Is the efficiency difference worth the 20 cents per gallon? I don't know, but personally I will burn premium, even at the risk of being flamed. I'm not saying CACresside is wrong, because this is sort of a subjective thing, but I do disagree with his position on this.

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post #15 of 104 (permalink) Old 05-22-2006, 09:05 AM
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Re: Fj Can Use Regular Gas...

You can use regular gasoline if you do not get on the throttle. So for commuting, regular is fine.

Pre-detonation occurs when there is sufficient pressure and temperature in the cylinders upon compression. If you are NOT on the throttle, the throttle body will prevent the pressure build up in the cylinders because LESS air will be drawin in the engine. Recall from high school physics, PV=NRT. So yes, go ahead and drive with regular gasoline but exchange that lead right foot for a lighter one.

As has been mentioned earlier threads, the ECU also manages predetonation by retarding the ignition timing.

Last edited by haulin79; 05-22-2006 at 09:07 AM.
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post #16 of 104 (permalink) Old 05-22-2006, 09:18 AM
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Re: Fj Can Use Regular Gas...

My salesman told me that it was OK to use regular gasoline. It makes you wonder what they use to fill it up when you pick up your vehicle and they give you a full tank...

That being said, I always use premium. I generally spend $3.10 - $3.20/gallon on 93 octane. I can't find anyplace that has 91 octane anywhere! Regular gas is $2.85/gallon so it really isn't worth it to try to skimp a quarter per gallon when I spent 32K for a good vehicle. It just isn't worth it.
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post #17 of 104 (permalink) Old 05-22-2006, 09:59 AM
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Re: Fj Can Use Regular Gas...

I feel really bad for those of you that have to pay for your own gas.....

I buy premium every time, it makes me feel warm and a little giggly...

I wish that AZ had 93 octane gas, what a bummer....

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post #18 of 104 (permalink) Old 05-22-2006, 10:31 AM
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Cool Re: Fj Can Use Regular Gas...

Got this from the dealer a couple of weeks ago. I have been matching the grade of gas depending on how hard I use the rig with no pinging or problems.

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post #19 of 104 (permalink) Old 05-22-2006, 11:13 AM
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Arrow Re: Fj Can Use Regular Gas...

Wow, I don't feel so bad now. I am paying about $2.99 for Premium 93 octain here in NN, VA. I agree that crying about fuel cost after buying a large vehicle like an Fj just does not make sense. GO buy a Yaris...
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post #20 of 104 (permalink) Old 05-22-2006, 11:16 AM
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Re: Fj Can Use Regular Gas...

There are a lot of valid points here, and here is something else to think about. I don't know how true it is, but a service mgr I talked with told me, so here goes...

Yes, you have knock sensors that change your timing to help control the possible pinging when using a lower octane. Sounds great! Only problem is, that is very hard on the sensors and I hear they're very pricey to replace. Another customer was there that has had to replace them, and wouldn't tell me how much, just that I didn't want to have to replace a sensor .

I believe you can use a lower octane, but it has it's consequences...
1. Less than optimal performance and fuel economy, which will have you filling up more often anyway, possibly costing the same as using premium.
2. You might have to replace $$$$ sensors. Will Toyota know, and not cover them? Expensive chance to take.

Make 1 less trip to McD's or Starbuck's once a week, that should about cover the difference in gas. People will pay $5 for a 16oz. cup o joe, but are freakin over 10-20 cents more for a GALLON of gas that'll get you a helluva lot farther than that Big Mac, or coffee.

Let's make it simple. Take you avg # of miles per year. 13200 for me. Now divide that by mpg, lets say 17, (I've been getting 18-20). Thats 776 gals a year. Times that by .20 (.10 if comparing mid and prem), the diff between reg and prem gas. That's $155/yr. Divide that by 12, (months). $13 bucks a month for me.

I know some of you drive a lot more miles than I do. Just plug in you own mileage numbers. The stuff in the middle is tha same, and the final # will vary.

For those of you that don't figure your miles, it's probably $1.50 to $3.00 more a TANK for prem., depends on how many gals you get and what grade your using now.
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