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Sedans Infiniti G35 Infiniti G35 Real World MPG
391 messages, Last post on May 11, 2009 at 5:25 PM
You are in the Infiniti G35 Forum. Your Hosts are pat & karens
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Replying to: codeman60 (Sep 22, 2008 8:36 am)
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Karen, I think those are GREAT numbers, given how you say you drive. I wish my number where as high as that! I'll be interested in what your numbers are on a long highway trip. My bet is 24-25 MPG, which would be great. BTW, I think the gas you are using is some of the best out there, from my experience. Unfortunately we not have any Shell stations in my small town. Thanks for the info. Jay 
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Replying to: paulo6 (Sep 22, 2008 8:48 am) Yes, I'm happy with the computer accuracy, paulo6. I've never had a car that was within 0.1 MPG of my calculation. I just noticed that I had a 15 hour error on my first fill up (duh!). My earlier 28.8 MPH was wrong. It should have been 31.7 MPH. Come to think about it, that number is meaningless, as it is based on the computer's mileage and average speed. It should always match the computer (duh!). I have noticed that if I top off the tank, the MPH will be a tad bit lower than the computer on an individual fill up. If I simply stop when the station pump cuts off, the MPG has been accurate to within 0.1 MPG. I suspect that this means the computer bases it's calculations on the useful capacity of the tank (actual volume minus the space needed by the fuel to keep the fuel pump submerged minus the remaining volume when the station pump cuts off).
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Replying to: pscheid (Sep 15, 2008 10:23 am) 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 |
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Replying to: codeman60 (Sep 23, 2008 4:02 am) 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
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Replying to: pscheid (Sep 23, 2008 5:10 am) |
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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! 
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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
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Replying to: sweendogy (Oct 05, 2008 4:13 pm) 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
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Replying to: durangojay (Sep 11, 2008 11:04 am) 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 |
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