I drove from Vancouver to Banff for the long weekend, and saw some great fuel economy on the Golden-Banff-Kelowna leg of the trip. 31MPG was achieved with relative ease. I averaged 110-115 km/h with numerous WOT passing zones, two people and lots of camping gear on board.

I should mention that I easily could have gone much further on the tank. 15.2 Gals = 59L, so the gas light had not come on yet.

The fuel economy from Vancouver to Golden was not nearly the same, 27.7 MPG. The drive on the Coquihalla was a blast though. Great weather, almost no traffic (Thursday afternoon) and a convoy of my G, a BMW, and a new Miata. We each took turns being the rabbit. There were several stretches of prolonged high speeds that would not have been attempted in any other conditions. Let's just say the G pulls hard in 5th at the top end...

mostly stock '04 M6 sedan btw...

 

Math might be off...

15.2 gal (I'll assume US gal???) x 3.78 ltrs = 57.456 ltrs
15.2 gal (let's use the imp gal) x 4.546 ltrs = 67.731 ltrs

taking 755 kms and converting to miles:
755 x 0.62 = 469.1 miles

469.1 / 15.2 = 30.8

so that part appears correct. We just don't know whether you used US or IMP gallons for your original calculation.

If you filled up with 57.456 ltrs, then your numbers work out. If you filled up with 67.731 ltrs, then your mileage ends up at:

67.731 ltrs / 3.78 ltrs = 17.918 US gal

469.1 / 17.918 = 26.18 mpg, which is probably in the ball park of what I've seen in my personal experience with my '05 AT sedan.

 

I think the M6 gets better fuel economy than the 5AT.

 

We use Imperial gallons in the GWN...or we did til we joined the rest of the world on a real system of weights and measures. So ours are bigger than yours.

 

I know it "may" be slightly better, but if it's >2mpg better, I'll be quite shocked.

 

I can believe the 31mpg with the MT RWD G35.

On my 2005 G35X I recorded all gas fill-ups since new and my gas mileage ranged from a low of 21.157 MPG (13.35 L/100KM) to a high of 29.237 MPG (9.66 L/100KM), which isn't bad for an awd vehicle.

I do not get as good of gas mileage with my 07X, it is less .

 

After review, the title should read "755kms, 15.6 gals, 30.1 MPG"

I blame some rounding error, but I am using US gallons in the calcs.

I fueled up with 59L, and as I said the gas light had not come on.

 

Not sure who your comment was directed at, but as my profile doesn't list my location (gotta get around to fixing that...), I'm going to figure it's me. I'm from Kitchener, ON...

 

Etirely attainable.....On my '03 Sedan and '03 Coupe (AT), I could get above 30 mpg's with ease....
C.

 

Got over 600km with trunk packed, spare tire/tools and a passenger to Montreal and a several WOT as well. With more than a 1/4 tank to spare...

Didn't calculate Litres/100km or MPG though..

 

My bad, I assumed since you assumed US gals that you were from US.

 

My '04 M6 averages about 31 at 110-120km/hour. On the '06 Lake Placid trip my best was 31.75 and on this years Quebec trip 31.9

In the city I only get about 21 or so. I've never driven at a steady 80 or so on the highway to try to maximize economy. I think another 1-2 mpg is possible.

 

those figures closely resemble mine, both city and hwy.

it is interesting to see the difference between the EPA estimate and real world results. i believe the EPA for a 6mt sedan is 21/27. the city 21 sounds about right but not the hwy 27. i'm not sure what their testing procedures are though...

i agree about the potential for ~33mpg if one were to drive the "speed limit". however, driving 90-100km/h would be painful on a nice dry hwy day in a G.

 

I could never keep my foot out of it long enough to consider worrying about milage.

 

No, the ratings are 24 city and 35 highway.