Premium Unleaded or Regular for your FX - Infiniti FX Forum : FX35, FX45 and FX50 Forums
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post #1 of 36 (permalink) Old 01-16-2007, 04:04 PM Thread Starter
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Premium Unleaded or Regular for your FX

I've read an article on MSN yesterday - 20 ways you waste money on your car.

http://articles.moneycentral.msn.com/Sa ... urCar.aspx

For the FX it can run on regular gas. The engine does not knock. But the gas cover says use premium for maximum performance.

Has anyone notice a difference or tried. I have treid both. Gas mileage appears to be the same or very close. Will I get more horsepower? Any difference?

2005 FX35 AWD
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post #2 of 36 (permalink) Old 01-16-2007, 04:08 PM
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Others correct me if I am wrong, but FX45 says to only use Premium 91+ octane, whereas FX35 "recommends" Premium for maximum performance. So you can use middle grade gas in the FX35 with no issue.

Current: 2006 Toyota 4Runner Sport V6 | White | 2WD |
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post #3 of 36 (permalink) Old 01-16-2007, 06:03 PM
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Re: Premium Unleaded or Regular for your FX

Quote:
Originally Posted by virgo_888

Has anyone notice a difference or tried. I have treid both. Gas mileage appears to be the same or very close. Will I get more horsepower? Any difference?
I ran 87 octane once because my gas station ran out of 93 octane and do notice the loss of horsepower. Even though it doesn't knock, I still prefer the 93 octane for maximum performance. If you can afford the FX, you can probably afford to pay for higher octane gas.

'05 FX35 AWD Black/Brick
Touring/Sport/Tow Hitch/Cross Bars/35% Llumar Tint/Viper 791XV Security/Remote Start System/RF 1800watts Amplifier/RF Dual 12" Subwoofers/Sunroof Deflector/Stillen STB
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post #4 of 36 (permalink) Old 01-16-2007, 06:09 PM
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Re: Premium Unleaded or Regular for your FX

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Originally Posted by aznqtboy984
If you can afford the FX, you can probably afford to pay for higher octane gas.
I agree. It probably doesn't make any noticeable difference but I'd rather treat my FX as good as I can. I only buy Chevron 92 Octane.

05 FX35, Silverstone, Graphite, Touring, Escutcheon, Sport Pedals, LED Dtrl's(thanks rookie), Stillen STB, +2 Timing, Stillen CAI, LMS Z-Tube, Grrrowwl!!, Plenum is next (OK - well - actually the G35 E-brake pedal is next, but I swear, something is going to happen with that plenum).
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post #5 of 36 (permalink) Old 01-16-2007, 06:35 PM
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You won't notice the difference if you're driving slowly.

Carrera Mike
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post #6 of 36 (permalink) Old 01-16-2007, 06:37 PM
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i been putting regular since i got it. NO prob.
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post #7 of 36 (permalink) Old 01-16-2007, 07:20 PM
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When I was in Boston I used Sunoco 94

Maryland/DC rarely have 94 so I use

Sunoco 93

2004 FX35 Golden Sand/Willow ll Touring ll Sport ll K&N Flat Panel ll de-badged ["FX" on the tailgate]
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post #8 of 36 (permalink) Old 01-16-2007, 08:53 PM
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I've always used super in the FX. The only time I've ever used 87 is during a long trip because I know I will use it all, then it's back to 93.

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post #9 of 36 (permalink) Old 01-16-2007, 10:12 PM
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87 all the time - no issues. And more $$$ in my wallet for Starbucks whooaa whooaa! hahahaha

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post #10 of 36 (permalink) Old 01-16-2007, 10:30 PM
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You won’t hear the knocking because the engine has the anti-knock system. It retards the timing as soon as it senses knocking and won't let you accelerate as hard because its sensing the fuel is detonating(lower octane) instead of spontaneously combusting(higher octane). Knocking is caused by lower octane fuel properties, which explodes swiftly, and causes the rattling on the valves, lifters and pistons, instead of combusting spontaneously which the VQ35/45 is engineered for. For the engine not sustain damage from knocking, they installed the knock sensors, which retards the timing in the expense of performance but do prevent damage.

Bottom line is, the ECU(engine control unit) will not let the engine accelerate as hard as it would if it had higher octane fuel. Hence the "for Optimum Performance use premium fuel" verbage in the owners manual.

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