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Infiniti G35 Real World MPG

392 messages,  Last post on Dec 02, 2009 at 10:55 AM

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

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#289 of 392 Re: MPG [ajpnj] by johninnj Aug 13, 2008 (9:18 am)
Replying to: ajpnj (Aug 13, 2008 6:47 am) Last Gen Z06 got like 29mpg highway....highway mileage is primarily gearing and aerodynamics. These cars are very smooth with the wind. 7 speed with a super tall 7th along with milder programming on the auto trans in D (After all...there is D and DS mode), would surely improve mpg a lot. If they dump a 7 speed in and leave the same propensity to hold gears for silly amounts of time or downshift so fast, the city MPG will still suck.
#290 of 392 Improved MPG in high mileage G35 by krsboxster Aug 19, 2008 (8:36 pm)
I've had an '04 G35 sedan (leather 6MT) since new. It now has 72000 miles. Up until now, I'd get about 17 - 19 mpg in urban driving (Wash DC) and 24 - 26 mpg in highway driving. I've moved and my mix of driving has changed to predominantly rural, so I'm not surprised to be averaging about 24 - 25 mpg in daily driving. However, I've recently done a couple of 360 mile trips and have gotten 28 - 29 mpg, which never has happened before. I have been using cruise control (limit + 5-7 mph) for years to avoid more law enforcement encounters, so that doesn't explain the change. I've tried 87, 89 and 93 octane gas, and octane doesn't seem to affect mpg.   Has anyone else experienced a bump up in gas mileage on a higher mileage G35?   [P.S. The car always has been awesome, but now that my driving is mostly rural mountain roads, it and I are much happier.]
#291 of 392 Poor gas mileage by durangojay Aug 25, 2008 (3:00 pm)
I have had my 2007 G35X for almost exactly a year and have 7500 miles on it. I have tried EVERYTHING I can think of to improve my gas mileage, but cannot seem to break 11-12mpg around town. Now on the highway, which I don't frequent as much as I would like, I get more like 23-24mpg. Does anyone have any suggestions for my around town driving, which I mainly do? I have tried every gear selection, being light on the pedal, octanes, oils, gas treatments, but nothing seems to help. The car has PLENTY of punch when I need it, and I'm not complaining about the car or cost of gas. I can afford it or I wouldn't have bought such a fabulous car. Any suggestions would be welcome. Thanks. Replies to this message: tfromatl (Aug 25, 2008 5:30 pm) krsboxster (Aug 25, 2008 7:49 pm) johninnj (Aug 26, 2008 6:41 am)
#292 of 392 Re: Poor gas mileage [durangojay] by tfromatl Aug 25, 2008 (5:30 pm)
Replying to: durangojay (Aug 25, 2008 3:00 pm) You probably need to lay off the hammer between stop signs.... But I have to agree with the other posters here. I have a G35 sport with K&N air filters. The mileage does improve as it breaks in. I used to get 20.1 in city driving and 24.2 hwy mpg but after my car turned over 20k my mpg has increased on the hwy 26.6. But on the highway I set the cruise on 81 - 82 and this thing just rides. I do take my car in for every service interval to keep it in good running condition. My only complaint about this car is also the result of it being a sports sedan, the tires don't last long. Expect to change the rear tires every 20k and the front tires every 28 - 30k (disclaimer "your mileage may vary see dealer for details....).
#293 of 392 Poor gas mileage by durangojay Aug 25, 2008 (6:22 pm)
Thanks for the input. So, you're saying that K&N filters might help? I've been advised by knowledgable people here that at this high altitude and dusty conditions, that the K&N will allow TOO much dirt through. Nevermind that I don't really believe in them as a rule. I run them in my Suburban, 8.1l, and it's a pain in the ass to change and clean them. Any other suggestions would be welcome...Thanks...Jay...p.s. I do maintain the car to specs and rotate tires etc... Replies to this message: tfromatl (Aug 26, 2008 4:53 am)
#294 of 392 Re: Poor gas mileage [durangojay] by krsboxster Aug 25, 2008 (7:49 pm)
Replying to: durangojay (Aug 25, 2008 3:00 pm) You may know this already, but aside from gradual acceleration, looking as far ahead as possible to anticipate red lights, congestion, etc. so that you're coasting (rather than braking) as you approach something that will slow you down is about all you can do. That said, depending on conditions in your area and your driving style now, it can make a fairly big difference (e.g., 2 - 3 mpg) around town.   I doubt that manual gear selection would do any good, and it might actually cause poorer gas mileage. I don't have an automatic transmission, but for best mileage the objective is to get into the highest gear, fifth or sixth, as soon as possible, and I'm guessing that Infiniti's settings and a light foot are your best shot at that. Replies to this message: johninnj (Aug 26, 2008 6:41 am)
#295 of 392 Re: Poor gas mileage [durangojay] by tfromatl Aug 26, 2008 (4:53 am)
Replying to: durangojay (Aug 25, 2008 6:22 pm) I believe the K&N air filters help. I am not qualified to tell you how they will perform for you in Denver. I live in the Atlanta area (home of one of the worst commutes in the nation). One thing for sure, the K&N air filters will provide you with much better filtering of dust and dirt than the standard paper filters. All of my vehicles have them as I put K&N filters on with the first air filter change. As you may know, we (Atlanta) are suffering one of the worst droughts in our history that has held on for over 2 years (until this week, thankfully). We have extremely high pollen counts, dust and just nasty air that comes with living in metropolitan areas.   You will probably see an uptick in your mpg as the car breaks in. I know they say the G35 breaks in around 1k - 1.5k but my car has done nothing but improve in areas of performance, mpg and ride. It was a little bumpy toward the end of my rear tires' life but now with new rear tires the ride is better than ever. I hope this helps.
#296 of 392 Re: Poor gas mileage [krsboxster] by johninnj Aug 26, 2008 (6:41 am)
Replying to: krsboxster (Aug 25, 2008 7:49 pm) Oddly enough....the stock programming is to hold each gear for WAY too long regardless of throttle. Showing off the 7600 redline? Who knows. Try this....put it in M mode and short-shift every gear....about 10 mph per gear seems to be the way to go. I will bet you $ your city MPG improves. It's a little easier in mine (Paddles), but same concept.
#297 of 392 Poor gas mileage by durangojay Aug 26, 2008 (7:24 am)
Thanks for the insight people. Perhaps I will try the K&N filters, although it will take quite awhilw for the savings to kick in considering the cost of them. Perhaps I do have a heavier foot than I think, but coasting around is not what I boughta 306hp car for,,,stay tuned,,,Thanks again. Replies to this message: sweendogy (Aug 26, 2008 4:54 pm)
#298 of 392 GAS UPDATE by sweendogy Aug 26, 2008 (4:54 pm)
Replying to: durangojay (Aug 26, 2008 7:24 am) 10k miles on a 2007 g X. Mixed driving car still has a problem hitting 20mpg-- if I drive city only its around 17 .. On 2 recent highway runs of 300 and 200 miles i have seen just under 22 and just over 24 respectively. That is 90% highway with cruise engaged for most of the trip with an avg speed of 72 mph. I have tried using the manual mode when stuck in traffic to upshift as quick as possible before the car would automatically and have no idea if this is doing anything for mpgs. I would wait on the K and N filters until your in need of a new filter.

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