I Have The Auto Trans. I Am Terribly Disappointed With The Mileage. My Driving Is 75% Highway And 25% City. I Cant Even Get 'chevy's City Average' Of 24mpg. Usually, I Get Around 22 Mpg. I Dont Drive It 'hard' . I Am Conservative On Takeoffs. I Can Get It Up To About 24/25 Mpg On A 15 Mile Ride On The Highway. Once I Get Off The Highway, , It Drops The Average Down To Around 20/21mpg, After Driving For Less Than 5 Minutes Around Town. I Had A 2002 Grand Prix 3.8l 6cyl. Prior To The Hhr. It Was Loaded With Power And The Mileage Was Pretty Much The Same. I Didn't Mind Sacrificing A Little Power By Getting The Hhr, If I Was Going To Get Great Mileage. A 1 Or 2 Mile A Gallon Difference Just Doesn't Seem Worth It. How Are The Rest Of You Faring?

 

I get over 30 on the road and 24 in town. It usually runs high 25's because most of my driving is in town. 2.4 no real mods.

 

I drive mostly in the city and get around 22.9-24.0.
But on the Highway (with only 20 in the city) I got 31.9, and on the way back with 150+ miles in the city I got 30.9.
Now I am back in town and I had about 268 miles on the highway at 31.0 with 35 miles in the city now reads 26, It counts even if you are at a stop light, that is on a thread here somewhere.

 

I have an auto 2.2 and get about 26 City and 30 Highway with the air going...thank goodness,because it's summer in Lower Alabama again. Yesterday it was 97 with 35% relative humidity...whew!

 

I do about the same road mix as you and get around 20-21 overall. But I did have mine tuned for HP.

 

We have only gone thru 1 tank of gas so far about 1/3 of driving in city, averaged 28.5 mpg. Pretty good for a new car, not broke in yet!

 

Well, how many miles do you have on your car? That matters. When I first got mine, the average wasn't good. But the more miles we put on the car, the better mileage we got. Now with all our mods, we get 24-25 city and 30-31 highway. Not bad since i'm tuned with bigger injectors. But when we step on it, man she drinks gas.

 

I drove a v6 Malibu before my HHR, and also expected alot better gas milage. However, driving almost all city miles, I too am disapointed. I get maybe 19 city, when I do drive distance it does very well though. I have mods, but not much..lowered, muffler, and 20'' wheels. I do not see that making that much of a difference. But, I love it so much that I don't care now, LOL.Todd (Uma)

 

Hey uma, nice ride. Like the twenty's and color.

 

My 2.2 gets about 27-29 city and 35+ highway. Its a 5spd with a real Cold Air Intake, GM Extrude Honed Manifold, SS/SC Downpipe and mangled exhaust (2.5" in some places 2.25" in others) to dual "fart can" mufflers. I can drive over a week on one tank. When we cruise around at 35 and I can stay in 5th for long periods of time I have seen 48-54 mpgs!!!! Not sure how accurate that is on the DIC but hey! Its kewl to see!