I have a 3 day old 07 Special Edition 2.4L HHR Automatic.
I have put 600 miles on it so far and I am getting 24 MPG in the city of Atlanta.

Keith

 

Welcome to the Club!

 

to the forum hope you'll enjoy your

 

to the site!!!

 

I average 25 city and 30+ on trips. I think it could be better but the way GM has it geared its not to bad and I also have a heavy right foot.

 

Driving back from Peoria IL today I averaged 27+ on the highway. This was with the cruise on 75 and all the windows open.

I was using 89 octane. Not bad considering I had mine retuned for max HP sacrificing MPGs.

 

I used to spend a lot more time over at the forums at www.saturnfans.com. The observation that gas mileage increases with use is very common there too. The three thousand miles reported by the original poster is not nearly enough from my readings.

I have 125 miles on my 2.2 automatic and I edging up to 22mpg from a starting point of 9.

Thanks Loneranger for the 4500 rpm hints.

 

Yeah man, just be sure the engine is up to full operating temp before doing the ring seating routine. Since the HHR has no display for oil temp, I made sure coolant temp stayed above 190 for about ten minutes before I would do any of the accel runs.

 

I made one very simular to this at home.http://cgi.ebay.com/ebaymotors/SAVE-...49496023QQrdZ1
Put it in and actually am not only getting >22 MPG when before consistantly getting 23 to 24 MPG.

 

Average speed plays a role in fuel economy because driving in lower speeds require driving in lower gears, and driving in lower gears result in lower fuel economy. Average speed won't tell you the whole story, but it gives you an idea of what's going on.

At 580 miles, my car was "broken in" according to the owner's manual as well as GM's "break-in procedure" for their crate engines.

I have a 2007 HHR Panel LT1 2.4L with a 5-speed manual.

Drove from Garden Grove, CA to Las Vegas, NV and back this weekend. Me and a friend with about 100 lbs of cargo.

553 miles - round trip
55 MPH - average speed
29 MPG
Air condition on the WHOLE time.
Outside temperature 87 - 115 degrees.
I now have just over 1100 miles.

Drive from Orange County to Las Vegas - 10:45 AM - 2:45PM
Made only a 15 minute stop to use the restroom. And stretch my legs.
I was getting 31 MPG and average speed was 69 MPH by the time I exit on to Las Vegas Blvd. By the way, Las Vegas has a higher elevation than Orange County, CA.

Of the 553 miles drive, about 15 of it was driven around town in Vegas. About 6 miles of it was driven around town in Orange County because I had to drop off a passenger.

If it wasn't for the traffic encounters on the way back home from Vegas, I would have easily achieved 33 to 35 mpg with the average speed of 69 MPH.

With my everyday round trip driving from home to work, I am on the freeway for 6 miles and on the city road for 2 mile. I hit 5 to 7 red lights every time. My average speed is 22 MPH and get 21 MPG.