My present overall average after 1900 miles is just under 20mpg. That's almost entirely back and forth to work, 10 miles each way, 7 of which are city streets and the rest freeway. I took my first longer drive this weekend, about 200 miles of mostly backroads with few stops. I was averaging a little over 25mpg. For much of the day distance-to-empty + miles driven was over 520 miles. I started with a full tank of Sunoco 93 octane. A huge improvement over my Durango at 12mpg and a lot more fun.

 

UPDATE: I'm at 7k miles now and computer shows 22.8 MPG with 90% highway driving for me. However, I am stuck in stop and go traffic for about 20 mins each day.

 

well i finished my first tank today. i averaged 19MPG for my first tank. And so far on tank two im averaging 20MPG.

360miles on my ODO.

 

I just managed ~29mpg over a 15mi trip from a gas station to my house - mostly freeway, some suburban. Boy, was I gentle. Nice to see she can be efficient though.

 

I took another trip to San Antonio form Houston yesterday/today. I reset my MPG/Avg. Speed computer and trip odometer on the fly after I reached highway speed. These are the results:

On the way there I set my ICC at 73. I had to slow twice going through Houston for accidents but other than that maintained a steady speed on the freeway. One brief stop for a restroom break brought down my average speed and slightly decreased the mileage from stopping and getting back up to speed. This photo was captured as I was nearing my exit off the freeway:


I drove around town a bit over yesterday evening and today. I reset the MPG/Avg. speed again once I hit the freeway coming home but this time set the cruise at 70. I got to Houston during late rush hour but the traffic was pretty good (for Houston). Here's how the return trip looks:


Verdict: Steady driving using the cruise will yield the advertised EPA mileage estimate of 17/26 for the 6MT and possibly better. MPG has increased as the mileage increases. Something for newer owners to look forward to.

 

Okay, just finished round one of a road trip (1400mi in the past two days) - best tank 26.9 mpg, worst was ~24.5 mpg. Not too shabby.

 

6MT or 5AT.. what speed? cruise control?

 

I drive mostly mixed. Computer shows 16.9-17.1 mpg at an average of 28 mph.

 

I drive city more often during summertime but still avg 21.4 with 2500 miles on it.

 

I just made a trip up to Burbank yesterday.. about 270 miles round trip.. i averaged 26.2MPG on the way up driving about 75-80.. no cruise control..

on the way back there was some traffic that stopped, and i drove about 15 miles on city streets...

Bring my overall milage for the trip down to 24.5 MPG.

6MT driving 75-80 without cruise control.. 800miles on my odometer..

EDIT: this is based on what the car computer is telling me. I have not actually done the math myself and check to verify that the car is in fact accurate yet.

 

Damm I'm jealous. I have 11k on my car and still get 22mpg at best with 90% freeway driving and using cruise most of the time.

Leaning towards a CAI, mostly because when I put a K&N Typhoon on my 04 G35 coupe my mpg jumped from about 22mpg to 25mpg CONSISTENTLY. Thats when I used to work 4 miles from home, and 90% city driving.

Now I work about 35 miles from home, and I'd say 32-33 of those miles are on freeway with barely any traffic.

 

I feel like the only G37 Driver who can't break the 20 MPG average for a full tank. I've been trying to shift around 2000/2500 this is making me NUTS! when I'm on the streets and there are just too many freeway on ramps calling my name. My tank average is around 15-18. On the freeway if I reset after I'm on I can get some pretty good runs 26/28/32 but once I get off the freeway MPG goes in the tank. Just put on Injen CAI but I haven't run it for more than a couple of miles on the freeway so I'm really intrested to see how that is. Volendan I think you'll be right about getting more MPG on the freeway because the engine isn't working as hard at speed because of the increased power.

Checkout my posts here On the Injen CAI in post 107 and 110 MyG37 > Tech Area > Engine, Drivetrain & Forced-Induction > Intake and Exhaust
*Latest Update on Injen Intakes*

I think I just went too long w/o a sports car when I started having kids, I've got to make up for some lost time. It helps that my Company pays for my car - Payment, Gas, Tires........

 

I just finished a 650 mile roadtrip. I drove between 80-100 the entire way but was mainly driving 85mph. The three stops i made killed the avg speed though. I didnt use cruise control at all. This was also done in a 6MT.

 

Last weekend I drove my G37S MT6 from Central NJ, to Montreal, Canada . On my way back, I filled my gas tank and left at 8PM, there was hardly any traffic and drove at an average of 75 MPH using my Cruise Control about 98% of the 6 1/2 hour trip.

By the time I got home, I averaged 24MPG and had used only 3/4 of my full tank. So if you are going to drive long distances and want to save on fuel, definitely use your Cruise Control!

I hope this helps.

 

+1 I have been pleasently surprised by the hwy mpg on my G.