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Infiniti G35 Real World MPG

391 messages,  Last post on May 11, 2009 at 5:25 PM

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What is this discussion about? Infiniti G35, Fuel Efficiency (MPG)

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#335 of 391 Re: Recommended Fuel, MPG, and Performance [pscheid] by pscheid Sep 23, 2008 (4:52 am)
Replying to: pscheid (Sep 15, 2008 10:23 am) My 04 Coupe's owner's manual lists a fuel "recommendation" of 91. It does not say "required" as you might find in higher performance vehicles. It says 87 can be used, the tank should only be partially filled, and a return to 91 octane as soon as practical. It also advises moderate acceleration habits when using the lower grade fuel, specifically warning about what we all like to do......tromp on it.   As I mentioned in a previous post, I ran 89 when the gas prices topped $4 per gallon. I did it for a period of a couple of months, and the fuel economy remained at least THE SAME. Perhaps the fuel prices toned my driving down a bit. I'm back to 93 because that is the next octane above 89 available in name brand gas that is marked "premium" in my neck of the woods.   But many posters wonder what impact the drop in fuel grade actually has on performance. The 04 Coupe owners manual says 91 for max performance. So how much does the performance actually drop off with a reduction in octane? I've never seen this tested or measured in car mags, etc.   My wife was reading up on the new Hundai Genesis (worth a look) on the Hundai web site. Under the specifications section (I believe) it provided both horsepower and torque for the standard V6 and optional V8, for "premium and regular" fuels. I was amazed to see the two ratings.....never saw that before for ANY car.   Guess what? With a drop to "regular fuel", hp and torque fell off about 5 each, not much on a V8 cranking out horsepower in excess of 350 (on a Hundai! Don't quote me on the 350, I think it was actually higher!).   It has been written that the higher octane fuels don't do what you might assume, boost performance noticeably. The Hundai specs confirm this. Octane's primary purpose is to prevent detonation during the combustion cycle. That's it.   So using an octane higher than "recommended" or "required" by the manufacturer does nothing more than drain your wallet because there is no appreciable gain in either fuel economy or statistical hp/torque ratings. If you think about it, 5 hp on a base of 280 hp (the 04 Coupe) is about 1.7%. On your newer Infinity which probably has 306-337 hp, the percentage is less!   Wish some lab rat would jump in here and add some statistical fact to our anecdotal discussion.   Jack
#336 of 391 Re: Infiniti G35 Owners: MPG-Real World Numbers [codeman60] by pscheid Sep 23, 2008 (5:10 am)
Replying to: codeman60 (Sep 23, 2008 4:02 am) Re the hours and average mph, we need to confirm when these figures are being accummulated on the Infinity. When the engine is running (certainly), when the ignition switch is merely on accessory (engine not running), or both.   I have a wife, so sitting in a parking lot at a mall with just ignition on just the accessory position and listening to a ball game is not uncommon. Of course, I'm sitting in row Z99 about 200 yards from the door to avoid door dings. Would probably save on fuel if I parked closer.   Jack Replies to this message: codeman60 (Sep 23, 2008 9:48 am)
#337 of 391 Re: Infiniti G35 Owners: MPG-Real World Numbers [pscheid] by codeman60 Sep 23, 2008 (9:48 am)
Replying to: pscheid (Sep 23, 2008 5:10 am) Engine running except for possibly 5-10 minutes out of the 52 hours. Except for pauses in traffic, at red lights, and during startup, I don't spend any time idling.
#338 of 391 SF Bay by 1nickatnite1 Sep 28, 2008 (8:50 pm)
Last fill up I got 22.3 MPG wit 80% highway and 20% city. Been using only 91 and the car just broke 1100 miles, hopefully it keeps getting better!
#339 of 391 update:07g35x 10800 miles by sweendogy Oct 05, 2008 (4:13 pm)
409 mile trip from boston to nyc and back.. cruse engaged for half the trip of mostly highway miles.. avg 22.8 (23 on the trip computer) . I tryed to run the tank (93 octane)completely out as the warning light went on, I have noticed that the warning light goes on when there is 3 gallons left in the tank. I ran the car for 25 miles with the light blinking and the scary **** showing up on the nav screen-- filled up and put in exactly 18 gallons -- why does the screen go blank when there is roughly 50 miles left on a tank?? on long cruses this car is terrific Replies to this message: pscheid (Oct 05, 2008 6:15 pm) sweendogy (Oct 06, 2008 4:24 pm)
#340 of 391 Re: update:07g35x 10800 miles [sweendogy] by pscheid Oct 05, 2008 (6:15 pm)
Replying to: sweendogy (Oct 05, 2008 4:13 pm) sweendogy........Your experience with fill-ups and the is pretty much the same as mine. The 04 Coupe has a (stated) fuel capacity of 20 gallons. When the low fuel warning light goes on, the tank will take on about 16 gallons. At distance to empty-------, it will take about 18 gallons to fill, meaning you still have some fuel in there.   My mechanic advised not to run the tank down to ------- which is 0 miles to empty. The in-tank fuel pump uses the fuel to remain cool. Other than make sure you never run out of gas, that may be the reason for all the advanced warnings (light and DTE).....to protect the fuel pump. If you ever had to get a new fuel pump in a car where the gas tank has to be dropped to replace it, you many want to think twice about running the tank down to DTE-------too many times. Expensivo!   Jack Replies to this message: sweendogy (Oct 06, 2008 4:24 pm)
#341 of 391 Re: Also... [durangojay] by pscheid Oct 05, 2008 (6:23 pm)
Replying to: durangojay (Sep 11, 2008 11:04 am) durangojay......hope your car has been repaired successfully by this time.   You noted you live in Colorado at an elevation above sea level of 6,600 feet. You might find some interesting information in your owners' manual under "Fuel Recommendations." There is a subsection about operating the vehicle above 4,000 feet......at least there is in my 04 Coupe manual.   Jack
#342 of 391 Re: Required vs Recommended [durangojay] by pscheid Oct 05, 2008 (6:31 pm)
Replying to: durangojay (Sep 15, 2008 12:47 pm) durangojay or anyone......   My 04 G35 Coupe's owners' manual states a fuel recommendation, not a fuel requirement. Is that because the 306hp and 330hp engines actually require a higher octane rating? Could you check your owners manuals on that?   Thanks, Jack
#343 of 391 Re: update:07g35x 10800 miles [pscheid] by sweendogy Oct 06, 2008 (4:24 pm)
Replying to: pscheid (Oct 05, 2008 6:15 pm) JACK--thanks for the post..interesting stuff -- i still think 2-3 gallons of gas should not be considered a low tank--i hear you on the fuel pump issues . ..thanks for your input and durango lives in Co.. he crashed his car and got its being fixed in --wait for it--Durango Co.. loner car-- a dodge durango--hope that helps
#344 of 391 Almost there... by durangojay Oct 07, 2008 (6:16 am)
At the risk of going off thread...my car is almost ready. Thursday or Friday hopefully. It has taken about 21 man-hour working days to repair. No major frame damage, which is good. Thanks for the great posts. I get nowhere near what you guys are getting in city MPG. Will continue to post MPG after I get the car back. And yes, I really did get a Dodge Durango rental loaner covered under insurance. Weird, but true. p.s. Cannot wait to get back in that sweet ride! Replies to this message: johninnj (Oct 07, 2008 6:19 am)

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