Next time you get to the highway, reset one of the two MPG averages (my non-GPS Journey has one on the dash console, another on the center display) and see how it measures when actually on the highway. Check it as you're exiting after a 20+ mile run. I'm sure it'll be a lot better.

After 5k miles you should be getting better MPG with the break-in.

I'm getting 18.5 overall average, that's 80% city 20% highway. Upper 20's on the highway.

 

The best mileage I ever squeezed out of my 09 xS sedan (with 5700 miles on it) was 26.4 mpg. I'm mostly in the 16 to17 range around town and I find it pretty hard not to enjoy the higher speeds when out on an open highway. My goal was not great mileage when I bought the car

 

I have owned quite a few vehicles, including 2 diesel motor homes and every forum I have been on has posts that say your fuel mileage will get better as the vehicle breaks in. I have never personally experienced this. One thing I do is try and put several hundred or so break-in miles on the new vehicle before my first extended highway trip. It's possible if I took a new vehicle immediately on a long trip it would not get as good a mileage as the following trips. I only check for highway mileage, since there are so many variables as far as city mileage, especially which city you live in and how the same route depending on congestion,construction,red lights,etc can result in quite a bit of difference in fuel mileage.

 

It is, but one of the great things about driving a G is that there are so few who can actually accelerate fast enough to cut us off if we have to slingshot them in the middle or right lane.

 

It was definitely true of my last two vehicles, Subaru Legacy GT Limiteds. Got around 23mpg when new, combined driving. By about 12K, they both were at about 26. The G is just over 10K, and I'm not seeing any improvement, but 23mpg for this size/weight/power ain't bad. And I put my foot in it quite a bit. My commute is about 70% interstate, 20% country secondary, 10% town.

 

So true, in Dallas most of the N, S, E and W roads are three lanes in each direction with decently timed traffic lights and 40-45 MPH speed limits that it's close to being on a highway. That's how I can drive spirited and still average 18+ MPG.

 

What's that? I don't plan on beating the crap out of mine when I get it, but I won't be babying it either. A few revs up to 5/6K rpm once in a while during the early miles shouldn't hurt anything once the engine is fully warmed up.

 

Interesting reading here -

Break In Secrets--How To Break In New Motorcycle and Car Engines For More Power

 

Strange I just hit 1,000 miles on my G last week and have been averaging 22 MPG in the city, just driving to work which is about 11 miles each way. Can't wait to go on a road trip....

 

These cars do get pretty good MPG on the highway. I got just over 27mpg on a trip from LA to Vegas which averaged 80-85mph. I also found out that the cruise control won't engage over 90mph. :P City MPG is a whole other story.

 

I've gotten 28 m.p.g. from our X over a ten hour road trip. That's with the wife and child in the car so full-on family sedan mode was engaged.

 

This is the first car I have had where the mileage increased significantly after 1500 miles. Be patient. The mileage does increase quite a bit the slower you go on the highway. If I am on a two lane and set cruise at 65 I can get 30mpg but if I jack it up to 80 on the interstate mileage drops fast to 24mpg.

 

My first 6,000 mi.


My G37S 12/07/2011 - 15:29 5,903 mi 17.155 gal $2.22 $38.08 No No 0 MPG Gasoline - Premium (93) 93 Getgo

My G37S 12/07/2011 - 15:28 5,833 mi 4.252 gal $3.53 $15.01 Yes No 16.77 MPG Gasoline - Premium (93) 93 CircleK

My G37S 10/23/2011 - 04:10 5,544 mi 18.12 gal $3.49 $63.22 No No 16.77 MPG Gasoline - Premium (93) 93 Speedway

My G37S 10/01/2011 - 13:43 5,236 mi 18.201 gal $3.39 $61.68 No No 16.998 MPG Gasoline - Premium (93) 93 Speedway

My G37S 09/17/2011 - 12:48 4,842 mi 17.712 gal $3.68 $65.16 No No 21.647 MPG Gasoline - Premium (93) 93 Sunoco

My G37S 09/03/2011 - 09:50 4,505 mi 17.324 gal $2.75 $47.62 No No 19.027 MPG Gasoline - Premium (93) 93

My G37S 08/10/2011 - 21:57 4,198 mi 17.716 gal $3.68 $65.18 No No 17.721 MPG Gasoline - Premium (93) 93 Marathon

My G37S 07/23/2011 - 19:33 3,862 mi 17.52 gal $3.76 $65.86 No No 18.966 MPG Gasoline - Premium (93) 93 Sunoco

My G37S 07/15/2011 - 11:58 3,552 mi 17.65 gal $4.00 $70.58 No No 17.694 MPG Gasoline - Premium (93) 93 Sheetz

My G37S 07/05/2011 - 14:35 3,207 mi 17.621 gal $3.60 $63.42 No No 19.547 MPG Gasoline - Premium (93) 93 Speedway

My G37S 06/29/2011 - 19:39 2,826 mi 17.861 gal $2.96 $52.85 No No 21.622 MPG Gasoline - Premium (93) 93 Getgo

My G37S 06/12/2011 - 14:08 2,478 mi 15.796 gal $4.04 $63.80 No No 19.484 MPG Gasoline - Premium (93) 93 Shell

My G37S 06/01/2011 - 12:39 2,162 mi 16.916 gal $3.91 $66.12 No No 20.005 MPG Gasoline - Premium (93) 93 Shell

My G37S 05/27/2011 - 04:25 1,768 mi 17.566 gal $4.10 $72.00 No No 23.292 MPG Gasoline - Premium (93) 93 Shell

My G37S 05/05/2011 - 21:45 1,433 mi 16.574 gal $3.20 $53.02 No No 19.071 MPG Gasoline - Premium (93) 93 Getgo

My G37S 04/30/2011 - 09:23 1,084 mi 16.02 gal $4.37 $69.99 No No 21.057 MPG Gasoline - Premium (93) 93 Shell

My G37S 04/12/2011 - 18:08 800 mi 17.027 gal $4.05 $68.94 No No 17.728 MPG Gasoline - Premium (93) 93 Shell

My G37S 03/28/2011 - 12:30 500 mi 16.456 gal $2.26 $37.17 No No 17.619 MPG Gasoline - Premium (93) 93 Getgo