It definitely likes to go fast, it's sweet spot is around 30-40 km/h over the regular highway speeds so you have to be sooo careful and monitor your speeds constantly or use the cruise. I also find myself putting my foot down every time I am entering some nice curves in the road. It is a fun car.

 

Both the G35 and Corvette however around 0.27-0.29 coefficient of drag. It’s a wash.

However, the new Vette weighs about 3150 lbs. That’s a major difference from the G. Take 500lbs. off the G and it too will get highway mileage in the upper 20’s.

You simply cannot overlook vehicle weight. 3600 lbs. is a lot of weight to overcome regardless of aerodynamics.

Based on weight alone, the G35 has to work harder than Corvette to maintain a fixed highway speed. I’d also venture to guess the G35 sees more driveline power loss to the wheels than the Corvette. I have nothing to prove that though. Just a guess because I believe Chevy spends a lot more time and money on the engineering of the Corvette when compared to Infiniti’s G35.

 

Dang, I just looked over mine and I'm averaging 18.5 MPG.
I'm barely peaking 4K RPM at around 80 MPH. I'm driving very modest during the break in stage with only 1100 miles.

This is 3 MPG less than the 350Z 6MT (Which I drove hard). I usually averaged 21 to 22 MPG.

 

Very true weight is a factor but less so once you're moving then coefficient of drag comes into play. You're right about the Corvette weight. But going back to my ZR-1 it weighed about 3500 lbs and was pushing 340 hp at the wheels or just over 400 hp and still I was doing 25+ mpg on the highway and 18 - 20 around town. Of course the other factor in any of these cars is gearing. The ZR-1 turned only 1800 rpms at 70-75mph. I noticed the G is much higher. I foget exactly but I thought it was like 2200 rpms.

Do I expect the G should get 28mpg? No, I know window stickers lie but still overall average should still be in the 20 -22 mpg not 16 - 18mpg that some of us appear to be getting. I have gone thru 7 tanks of gas and only 1 of the seven even broke 20 mpg. If I drive purly around town I see 14mpg and I'm taking it easy so I still feel something is out of wack just don't know what.

It'll be interesting to see as we get more and more owners of the '07 over the next few months and see then what the average mpg is. There is still too many of us with cars that are just being broken in.

And don't get me wrong I love this car. If the window sticker said 15 city and 22 highway I probably would have still bought it. It's the fact Infiniti said 18 and 28.

 

Doesn't the EPA pin down MPG on the stickers?

 

I have not gotten below 18.5 (bu tthe car computer) and am averaging 19.5 around town (w a cruising commute0 and when I checked got 24-5 on a highway trip, not babying it. I have just over 3000 miles. So yours is not getting its full milage potential.

 

the main problem I have is the same as mentioned earlier, don't put a completely unrealistic MPG on the window sticker. I have never had a car that was so far off what the sticker said.

I did notice something interesting today... The trip computer was showing 40 miles to empty, gas gauge was almost to empty, but I could only fit 16.5 gallons into the tank. Maybe there is something going on with the trip computer/gas tank sensor. I'll check my MPG by hand next time to see.

 

Correct. It's not Infiniti saying that.

 

The high rpm's in 5th gear at highway speeds doesn't help any either (5 AT). I keep checking to see if the car needs to shift. 3K at highway speeds on the auto's just seems high. I guess I'm just spoiled by the 6th gear in my old Firebirds and Corvettes.

I'm not convinced the weight is the reason either. I had a V8 firebird with a 4speed auto, big cam, 4K rpm stall, and it averaged the same as my G. They both weigh about the same. My Firebird wouldn't even pass inspection, but it managed equal mpg.

 

chuckg35 you're getting exactly what I would expect from this car. To make a correction I am on my 9th tank of gas and only one tank broke 20 mpg in which I drove 100% highway and got 21.

 

But bad milage compared to what? My previous car was a CTS-V and performance is only a little bit better but my milage was only in the 13's were the G gives me back 19's with the same driving. I think that we get great performance/economy, maybe the best in the segment.

Jpr

 

Wayne, I did approximately 3 hours of driving today with the G and also got 9.8 L/100km. At almost 29 MPG, I am extremely satisfied.

 

I'm just over halfway through my first tank (224 miles) with at least an hour to an hour and a half of stopped idle time (about 35 minutes of it at the dealer, and I had at least another 30-35 minutes), and I am still averaging 15.9mpg. I am amazed at how good the gas mileage is for the type of driving I am doing. I would bet I get 18-20 in city once I get past this first or second tank (and am not sitting idle learning the car as much).

 

Well, a least its good to know that the new HR's may not be gas guzzlers after all. Either that or your the lucky one of the bunch.

 

I don't find it too bad at all so far. I had four adults in the car and the trunk loaded with presents too, so I think 29 MPG (imperial gallons) is pretty darn good. I think that I will be able to get over the 30 MPG mark when the engine is fully broke in and in warmer temps.