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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: durangojay (Oct 07, 2008 6:31 am) Second, I was wondering if at your altitude of 6,600 feet above sea level that the altitude and rarified air has a negative impact on the fuel economy. Engine management systems can and do adjust the fuel/air mixture to accommodate for the reduced oxygen in a given amount of air by adjusting the fuel component. This is more of a "protection" adjustment to prevent detonation and control engine operating temperatures. But completely overcoming or compensating for the reduced oxygen content? I don't think so. I would expect fuel economy and acceleration stats to be adversely affected, regardless. Someone who knows more about this stuff than I do.......help us out here. Finally, if you are looking for an all season tire replacement instead of snows, you may want to read my thread on the G35 Coupe in the snow. Main Topic: INFINITY G35 COUPE Subtopic: G35 Coupe in the snow. Guys with RWD and AWD Infinities and other makes have responded with their experiences and recommendations, some tire brand and tire model-specific. I have a RWD Coupe, live in MA. (snow), and am looking to switch to an all season alternative myself. Have spent considerable time on the NTB website reading tire owner survey opinions, 13 different road condition stats, and expert road tests with a concentration on Infinity and BMW owners' experiences. My choice at the moment is the Bridgestone Potenza 960, and about 100 pounds in the trunk during the winter snows. While winter tires would be optimal, I can't bring myself to dedicating a $1,400+ set of rims and tires to accommodate the half dozen days a winter where I might get 6+ inches and road crews falling behind. Then I have to buy a new set of tires $900+ next March for the Spring, Summer, and Fall. At the rate the G Coupe chews up tires, irrespective of one's driving habits, it is looking like MPG and fuel expense is not far ahead of tire expense on the concern list. Some folks don't worry about total ownership expenses (taxes, insurance, depreciation, fuel mileage, tires, reliability/repair associated expenses, etc.). Some do. When you pick up your car, don't forget to bring the searchlight and magnifying glass to examine the repairs. Bring an anal/retentive nitpicking friend along too.....they can be helpful once in a while. 
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Thanks for the good words. I do feel that the altitude may have something to do with my reduced gas mileage. Other than look in the manual for suggestions and read helpful posts here, I don't know what to do. The body shop doing the work is absolutely top notch, but I will take your words under advisement. Unfortunately, most of the work performed is WELL above my comprehension. The best I will be able to do will be to check out the paintwork, fit and finish, take it for a drive, etc. As I have AWD I am not going to get snow tires, per se. Just something with a little more wet grip. I ran my OEM tires through a horrendously heavy snow year last winter and I was quite pleased with the results. So a small upgrade would be just the ticket. Thanks again. Jay. 
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After 70,000 incredibly enjoyable miles...around town between 23-24mpg and on the highway (70-75mph) 27-28 mpg using 89 octane half the time, 87 the other half.
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Replying to: clay2000nc (Oct 23, 2008 3:42 pm) 
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2007 G35x finally back from the shop. Still a couple of minor odds and ends need attention, but she rides like a dream. No more SUV's for me. Unfortunately, mileage is still the crappy mileage it was before, but such it the price of a sports car. I'll definitely trade MPG for performance any day. 
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Replying to: durangojay (Oct 24, 2008 8:28 am)
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HA! You're probably right! That is at least one good thing out of this! Ahh, the FAST feeling is back!!
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Replying to: durangojay (Oct 24, 2008 1:04 pm) |
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I got 2000 miles now on my 2008 G35xS, I drive short distances but once in a while I do longer HWY miles (40+ Miles). Of course I drive the car hard at times like it should be driven. But at times I make it a point to drive extra gently, even coasting a lot in D, but I cannot seem to get more than 300 miles/fill-up (17+ gallons)...that is no where close to the MPGs I am reading about here with NORMAL day-today driving. I use only premium. OK, it is 30 degrees now in Michigan already, but still... Trip computer averages 16 or so MPG and it seems to be pretty close to actual insights?? |
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Replying to: paulo6 (Nov 21, 2008 6:53 pm) Second. I've read in Edmunds and other places that the best fuel economy for cars lies within the 45-55 mph range. All things being equal, that's primarily due to wind resistance. Above 55 mph, wind resistance takes more than a simple straight line, algebraic toll on fuel economy.....at some point, for example, an increase in cruising speed of 10% will take more than a 10% toll on fuel economy. That is why a G35 will hit 155 mph (electronically limited) with 280-330 hp. But take off the electronic speed limiter to achieve 200 mph? The G and other cars would need to double the horsepower to gain that last 45 mph! Read Car mags' annual 200 mph shoot-outs. 500 horsepower isn't enough! You can translate that increase in required power and fuel consumption for small incremental top speed drops all the way back to 55 mph. Third. You are driving an awd vehicle. I would assume that with the extra weight and more moving parts (versus my rwd Coupe), your mileage will always be 5%-10% less than a lighter car rwd G with less moving parts. Now would be a great time to get a basis point for your car's (highway) mileage. I would suggest you take a 100 mile uninterupted joy ride on cruise at 60-65 mph once the car is warmed up, light or no traffic that would disturb your test. Set the cruise and reset your mpg once at cruising speed and that's it. Leave the accelerator alone! If it becomes necessary to disengage the cruise and then re-engage, stay EASY on the accelerator to get back to speed. I'll bet with your new car that isn't broken in that you'll still see 24mpg or more. Once broken in, the car is very capable of meeting or exceeding the EPA highway number. In the city, pure city driving, another story. I have to baby my car to get 18-19 mpg. One blast from a stop light and the mileage begins it's plummet. Simple aggressive driving (not all out), and the mileage plummets. I get 15-16 mpg with MY normal city driving style. The accelerator and your right foot hold the key to higher fuel mileage. I've written in other threads here that fuel octane (91-93 versus 89) has had no discernable effect on my fuel mileage. As for developed horsepower from an engine when changing octanes/fuel grades......Check out the Hundai web site. They provide horsepower and torque differentials for the new Genesis at varied octanes. The difference is surprisingly quite small. Off the top of my head, 1.5-2%! So if you want to see higher fuel economy figures, the answer is in the break in, speed, vehicle weight, and your driving style. There is no shame in resisting that accelerator. So few of us, however, drive the G for fuel economy. But it is nice knowing the car CAN achieve the city and highway fuel mileage the manufacturer claims. On a vacation this past August I got around 27 mpg to get to my destination, and somewhere around 13-14 mph tooling around. My son in law was stunned at the difference and asked what happened. "My right foot, that's what happened." 
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