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Sedans Entry Level Luxury Performance Sedans
11073 messages, Last post on Jul 16, 2009 at 1:47 PM
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Hi need some answers if possible,I have a G35 sedan 2004,I've been using 87 octane in my car w/no problems at all.Seems to me when gas gauge reads full,I watch the gas gauge over the course of the week,and I notice it stays up near-full for the 1st 85-100 miles I put on the car,then all of the sudden the gas gauge seems to go down quite quickly from there.I'm medium on the gas on occasion I will get on it medium to slightly hard,it seems I'm only getting 15.6mi/gal,does that seem a bit much or not!!!????.Anyways I've change the plugs to a performance plug also I installed a K&N filter,there is no gas leaks what so ever!!!,any suggestions would be greatly appreciated,I also do use my cruise contol also,do mostly city driving though, not alot of stop and go,thanks Darrin Lynch 
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Replying to: darrinzramz (Jun 13, 2008 8:32 am) 1) Over the decades I've had dozens of cars that were from Asia, North America and Europe, and every one of them has exhibited the same gas gauge characteristics as your car (i.e. the needle is fairly stable for say 100 miles following a fill-up, and then it drops like a rock). This is totally normal as the level of fuel when "full" is typically above the top measurement range of the gauge sensor. 2) IIRC, Infiniti recommends "Premium" gasoline for your 2004 G35 engine (an engine well known for its poor fuel economy by the way), you should check your Owners Manual to be sure. Assuming that's the case, by running regular you are forcing the engine management system to retard the ignition timing to keep the engine from blowing itself to bits because of the low grade fuel you're feeding it. In turn, retarded ignition timing will further reduce the already marginal fuel economy of your engine. 3) Given how modern engine management systems work, it is physically impossible for a K&N filter to improve fuel economy. In fact, there is a fair amount of empirical evidence that suggests this type of a filter can reduce your economy. 4) Based upon the reports of other owners of your car, 15.6 mpg is not too far out of line for "mostly city driving". Sorry I couldn't be more helpful. Best Regards, Shipo |
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Replying to: shipo (Jun 13, 2008 8:57 am) Fuel guage is what it is...I think it was the old BMW where they made the guage for the last 1/4 tank of gas almost 3/4 of the guage. It's rare that it matters how full the tank is when it shows full...but it really does matter when you're down to 1/8 a tank. High performance plugs and "high efficiency" air cleaners do almost nothing in a modern engine. Actually, most all additives also do nothing, in fact most car makers recommend against using ANY additives in the car. If you aren't driving aggressively, then about the only thing you can do that will really improve mileage is to turn off the A/C. |
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Replying to: ghstudio (Jun 13, 2008 11:10 am) I get consistent 22 mpg tank to tank. Why you would use low octane on a higher performance engine is foreign to me. My car weighs 3,700 lbs and still gets acceptable gas mileage on standard A/S tires because each month I regulate tire pressure and rotate the tires each 5K miles. Tires last longer, wear even and get the best efficiency as a result. It doesn't take much to get the specified MPG rating for your car if you are aware of the small details. Regards, OW |
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Replying to: circlew (Jun 13, 2008 6:41 pm)
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Replying to: circlew (Jun 13, 2008 6:41 pm) 
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Replying to: shipo (Jun 13, 2008 8:57 am) The inside of the filler door, the manual, the dealer techs, the salespeople, this board and a few other places have repeatedly explained about the compensation for lower grade fuel that these engines make -- and, of course, the way that it is handled is as you say shipo. I leave for a few months and then come back for a look see and we're still talking about the same stuff. I find the search facility works just fine -- why would the car require premium fuel, tell you it requires premium fuel and then surprise you when it runs at less than its most efficient? Wonder if there is a "glossary" somewhere here that would be like an FAQ page for folks -- sort of like: Fuel requirements Regular, MidGrade & Premium Oversteer Understeer Horsepower vs Torque: What we buy versus what we say we buy Drive Bias: front, rear, neutral, all Naturally aspirated, super charged, turbo charged, twin charged And so on. . . "Hey doc, it hurts when I do this. . ." Doc: "Well then, don't do that. . ."
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Replying to: yjbeach (Jun 12, 2008 5:15 am) I MAY have had a headlight or tail light burn out LAST CENTURY. I also had brake rotor warping issues in my 2001 A6. My experience with over 2 dozen Audis is, statistically, probably not significant, but as an anecdote, it bears writing here perhaps to balance the "Audi still has problems. . ." Overall, I have no evidence that Audi still has problems. My '05 A6, soon to be gone, will be missed. In so many ways it is still ahead, by years, of the newest CTS -- if you could test drive these two cars back to back, the content and performance of the C6/A6 vs the CTS demonstrates this point. The amount of trouble with dozens of Audis has NOT been zero. It just has never been electrical as your post suggests. Another corner heard from.
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Replying to: markcincinnati (Jun 14, 2008 7:41 am) link title Regards, OW |
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Replying to: 1nickatnite1 (Jun 13, 2008 8:44 pm) |
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