- #385 of 391
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another update
by sweendogy
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Apr 10, 2009 (12:58 pm)
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14200 miles on the car - again mostly highway over 400 miles got 22.6 mpg-- this is prob the top end of the range-- most of my posts have been 22 or so-- with city driving a terrible 12-15 mpg. G
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- #386 of 391
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g35 premium gas
by basketballgod
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May 07, 2009 (5:13 pm)
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has anyone used regular gas on their g35 instead of premium, and if so how was that affected your car. thanks for your help
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- #387 of 391
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Re: g35 premium gas [basketballgod]
by rhard49
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May 08, 2009 (7:40 am)
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Replying to: basketballgod (May 07, 2009 5:13 pm)
Yes I have, I initially had a lot of hesitation in my car being pissy I figured I'd try regular. It felt like it ran better and the hesitation disappeared, using regular is not going to harm your car you have a knock sensor that is going to retard the timing reducing the power at the detection of any knock or pinging. I haven;t gone back to premium but I do fill my car half 93 half 87 when I'm on E.
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- #388 of 391
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Re: g35 premium gas [basketballgod]
by pscheid
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May 08, 2009 (8:12 am)
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Replying to: basketballgod (May 07, 2009 5:13 pm)
I agree with rhard. The knock sensor works perfectly and retards the spark to protect the engine. While there is a slight drop drop in horsepower and torque using the lower octanes, it was not that you would notice it. My fuel mileage didn't drop either. But I always use a name brand fuel to get the cleaning agents.
The only car manufacturer I am aware of that lists in their web site horsepower and torque differentials between premium grade (91-93 octane) and regular (87 octane) is Hyundai. For their new 370+ horsepower Genesis! I was staggered that the hp and torque drop-off was so negligible, only a few hp and lb. ft.
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- #389 of 391
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Re: g35 premium gas [rhard49]
by nycdude
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May 08, 2009 (7:52 pm)
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Replying to: rhard49 (May 08, 2009 7:40 am)
I started moving away from premium gas when i had my M35 and gas prices were going up daily. I used 89 octane and am still doing so with my 2008 G35. Absolutely no ill effect. I'm not sure, but I think with 89 you would have the equivalent of 1/2 tank 93 + 1/2 tank 87. 
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- #390 of 391
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Re: g35 premium gas [basketballgod]
by ziggy66
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May 11, 2009 (4:15 pm)
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Replying to: basketballgod (May 07, 2009 5:13 pm)
I have a 2005 coupe with 35,000 and a 2007 35x with 39,000 and have used nothing but 89 grade. Have never seen a drop in performance or mileage. I haven't tried 87 unless my wife, bless her heart, is trying to save on gas money. If she has I never noticed and difference. The coupe get 24.5 on trips and 18.5 around town and I'm a hot dogger. The 35x gets 23.5 on trips and 17.5 around town.
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- #391 of 391
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Re: g35 premium gas [ziggy66]
by sweendogy
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May 11, 2009 (5:25 pm)
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Replying to: ziggy66 (May 11, 2009 4:15 pm)
14k miles and for the past 12k its been all regular< no loss of power. gas mpgs not good at 18 for the life of the car.
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