i've seen 27mpg cruisiing on highway speeds for a trip on the g37x's

 

I get about 40mpg going at 150 mph then let go of the gas and let my car cruise down the road.

 

Last weekend got 26 MPG on a 180 mile trip from Lime Rock CT to Boston. Driving around town in suburban Boston I typically get 16 MPG.

 

That's not correct. Maybe 1 MPG if even that.

I've averaged over 27-28 MPG on a long trip with 1/2 of that at 70-75 MPH and the other 1/2 at 45-50 MPH.

 

On the drive home from the dealer after purchasing my '09 G coupe (rwd), I cleared the trip computer's average mpg and saw between 27 & 28 while strictly driving on the highway. In case you are interested, the car had 26 miles on it when I purchased it.

My average over the last couple of months has been 23.7 to 23.9. I have about 18 miles of highway on my 23-mile (one way) commute to work. On the way home, I take another route, which has less highway, but I'm very happy with that average fuel economy in this car. My car now has about 3K miles on the odo.

 

i get 25mpg on the highway and in the city and i dont even look, don't want to upset myself.

ACCELERATION > MPG !!!

 

damn i get 17-18mpg with 50/50. im still happy tho my camaro SS only gets like 11 haa

 

Yup, I pull just under 25 mpg in my commuting on average. I'm assuming that has to mean on the highway I'm actually getting 27 or so MPG, since city driving will through that average off quite a bit.

 

If your concerned about mpg go 55 and feather the throttle to speed every time you accelerate. I also use M mode to improve mpg. Above 60 drag will decrease fuel efficiency. Also accelerate when going downhill and let the car carry its self when no longer on a decline. Look up Hypermiling

 

I have 13 miles home to office and tend to try and get there as fast as I can without a ticket.....so good so far. Love stop light to stop light runs. Never seen the north side of 20 on the mpg. Most of the time is reading about 15.

 

I posted this on another thread --

Based on running the tank from topped off to near empty to topped off for reasonable estimates, I have seen so far:

City:
short daily trips to work around 19 MPG
general small city/ rural cycle 20-22 MPG

Highway (trips):
80% interstate plus some city 25-27 MPG
100% interstate, 75MPH, 450 miles straight (best tank so far) 30.5 MPG

I was surprised to exceed the 25 MPG EPA highway rating and amazed at the 30 MPG on one tank. This was with 91 octane fuel and I think no ethanol in it and driving 450 miles in one day.

Note: City driving here is moderate paced, occasionally spirited, rarely 6000+rpm. This is not large city driving with stop-and-go, idling in traffic jams, or lights on every block. I would expect significantly less MPG under those conditions if a lot of time is spent in gears 1 to 4 which have low ratios.

 

I wouldn't say I'm concerned, but I'm interested in MPG for a car in this class when the main competitor (BMW 335i) can offer serious power AND decent highway fuel economy.

I want similar results with my G as I heavily cross shopped the 335i. I'm happy to report that my first road trip this week (800 miles round trip) ~ 25 mpg with speeds between 77-82 mph.

My motor only had 500 miles on it when I left so it was still breaking in. I would expect a bit better MPG once it's fully broken in. I'm pleased with the highway MPG and sure I could see 27-28 mpg if I kept speeds closer to 74-75 mph. Full syn. motor oil may help a bit.

 

I get a constant 15 litres per 100 KM but when I installed the Injen CAI it immediately dropped to 12 l/100km. After resetting the ECU, it went right back to 15 l/100 km. Mostly city driving with the occasional short burst on the freeway. You do the math.

Update: I set the screen to U.S. units to see what the MPG would be and was surprised it was still 15. I thought there was a problem with the information but found a conversion where the formula for converting to miles per US gallon (3.785 L) from L/100 km is 235.2/x, where x is value of L/100 km. Entering the above info, I get 15.68 MPG for City driving.

 

I have a 2008 base coupe...I drove from San Antonio to Lafayette, La and averaged 27.5 MPG...all highway and going 65 mph the whole way....I'm sure with a 2009 with the 7 speed you can do better...

 

'09 AWD sedan with 7AT...I'm heavy on the pedal in city driving and average around 19. On highway trips with speeds ranging from 65-80 depending on traffic, I can easily average 25-27 (or even better if traffic is light).

Not that I care...if I cared I'd have bought another Elantra. If you can afford a $40K+ car you should be able to afford a couple extra bucks to fill the tank.