I'll call this a YMMV thing. I am not saying your assertion is untrue, but I highly doubt that any increase in fuel economy is due solely or even in part, to turning the engine off at stop lights. There are way too many variables in play, some in your control, and some not, for anyone to definitively say an increase is due to one thing and one thing only.

Fuel economy is something best judged over time after a variety of driving conditions. Even tank to tank economy may vary even if nothing would appear to be different. The gas itself (brand, octane, time of year, batch, refinery etc.) can affect mileage.

I hope you enjoy your HHR. And remember, even your worst fuel economy as reported is still very good and in the range most members get.

 

I Appreciate Everyone's Comments. First Of All, When You Are Posting Your Mileage, I Wish Everyone Would Remember To State If They Have The Auto Or Manual Trans, What Year The Hhr Is, And How Many Miles They Have On It. However, Please Note - I Know All About Driving Conditions, Hills And Flat Roads, Jackrabbit Starts, Tire Pressure, Toping Off The Gas Tank, Etc. I Manually Calculate The Mpg Each Time I Fill Up. The Dic Is Always Very Close To My Manual Calculation. I Still Think The Mileage Stinks For The Amount Of Highway Driving I Do. Before I Got The 2007 Hhr (auto Trans), I Had A 6 Cyl Pontiac Grand Prix 3.8ltr. 200hp. I Got About The Same Mileage On Her, Give Or Take A Half Gallon And She Had Twice The Power Of The Hhr. I Dont Even Attempt To Pass Anyone Anymore. The First Week I Drove It I Knew The Hhr Just Cant Do It. It Cant Even Get Out Of Its Own Way. Getting An Extra Half Mile Per Gallon, While Driving On The Highway And Driving Gently, Just Isnt Worth The Investment I Made. I Brought It To The Dealer And After Leaving It There All Day, I Went To Pick It Up And The Idiot Service Mgr Says To Me 'there Is Nothing We Can Do About The Mileage!' Then Why The Hell Didnt He Tell Me That When I Made My Appt? I Dont Understand Why I Should Be Happy With 21.5 Mpg When The Majority Of Owners Are Doing Much Better. This Will Be My Last Gm Car. No Wonder They Are In Trouble. For Anyone Looking - Stay Away From Schumacher Chevrolet In Little Falls, Nj. They Were Great Until I Paid Cash For My Car. Once I Drove It Out Of The Showroom, They Forgot My Name.

 

After 24K miles on my '06 with a 2.4 auto HHR LT I'm averaging 30.1 mpg. I've taken several road trips 2-3000 miles since owning the car. Around town only, I'm getting 25 mpg, but there are lots of highways down in Florida. I have notice lower mileage with 3 passengers riding along. I use cruise control on the highway. Taking backroads and keeping to 55 mph, the DIC says I'm getting 34 mpg.

 

2.4 LT 13,000+ miles. 10% Freeway/90% 'round town - Town avg - 18 mpg+/- and Freeway avg 29 mpg+/-.

 

Sorry, but why would I or anyone else put creditability on a post from someone who had no apparent understanding of the English language, grammer or punctuation, let alone the fact that every word is capitalized?

 

As it's been pointed out before, the MAJORITY of HHR owners are not part of any HHR web site. The 4300 or so members here (only a fraction of them post at all)(not all of them HHR owners) would on be a small percent of total HHR owners.

 

Sounds like I could post the same, but w/ 23K.

 

We drove from Western New York to Florida last week and the computor said our trip did 29.7 miles per gallon.( 75 to 80 miles per hour )
Our HHR went thru the Mountains of West Virginia and Virginia with no problem and we were hauling alot weight (4 Boston Terrier's,2 Dog cages and alot of Luggage.
The best we ever did on Highway mileage was 31.9 mpg with just the Wife and I driving on the interstate and Country roads in New York.
Hope this mileage information helps.

 

Mine has 13XXX, 80% town, 20% highway (55-60 MPH), and I average 21.9... But I am a spirited driver ...... I take off quicker than others at stoplights, accelerate quicker, pass a lot of people, and don't really keep a steady speed a lot of times... It may sound bad, but it's not like speed-demon type driving, just spirited..

Not to thread-jack, but I used to live in WV for about 8 years... Didn't like it, but it's a nice place to visit..

 

2.4 w/ 5-speed 18K miles. I get 25-27 mpg combined. Saw as high as 31 one time with straight highway miles. Low was 19 mpg going across Nebraska.