2.4 auto mostly city driving. With A/C DIC shows 17 - 18 not using air 18 - 19.
NEVER saw 20. Tire pressure is checked every week always 36 - 37 lbs.

 

Umm...jack rabbit starts? Maybe I'm an idiot but humor me please...

 

Jack Rabbit start = quick off the line instead of easing away from a standing stop. Horrible fuel waster.

 

yeah .. occasionally ill squeel my tires leavin a light to mess with some ricer or ghetto wanna be car

BUT normally i take off slow so my gas mileage avg . stays up

 

I have been able to get a consistant 35 m.p.g. (highway) out of my 07 HHR 2.2 manuel trans. observing posted highway speed limits 65 and 75 m.p.h. If I push it to 80, I can still average 33 m.p.g. on Colorado rural roads.

 

That sounds way low to me. I have only had my 06 2.4 auto for 2 weeks, but it is currently getting 24.0 in mixed driving in the winter here in Ohio. On the highway it has gotten from 27 to 31 based upon speed, temp and headwind. I would expect it to average at least the EPA estimates in Florida. Maybe have the ECU checked out and have the car tuned to stock?

 

I think it's your math skills. I rememner seeing someone here that SAID he was getting 40mpg

 

just a tip to people complaing about city mileage. at least with my 2.2 auto 40 mph yields insane mileage. i tested it and reset the dic and ended up with 39 mpg for 10 mins on a flat road. just carefully get up there and cruize around at 40. around here that is speeding but most people go even faster than that. in town he cops really dont care.

 

For the SS drivers learn how to drive by the boost gage if you want to max your milage..keep it below "o", can't always be done but after comparing you'll find the zone to work with and sometimes you have to feather off a bit to get it where you want then ease it back up to maintain milage.Play with it and you'll see.

 

even driving with it's tacked right at 0 on the highway and driving on flat surface its about 20-25 on the INST reading....the best results I have found when you still have to be giving it a little bit of gas is when its right around the 10 in vaccuum....that seems to always get between 40-60 inst.