Well I'm in the ballpark now after resetting the DIC.
The mileage I got was with the tune off, next I'll switch it on and compare readings.
This next test will be done early on Saturday morning when very little traffic is on the L.I.E. (Long Island Expressway) and I can cruse at a constant 70 mph with the cruise control off.
I'll make a 40 mile round trip.

 

But why haven’t you answered my question?

 

Sorry Blue missed your question to me
"Cat Man , what air filter set up do you have on your HHR? Paper or oiled?"

I have a AC Delco paper filter that I installed at 20K when I bought the car. It now has 55K on it.

 

Alrighty then, I wanted to clarify that, someone might assume it was the oiled type filter and maybe to much oil.
Thanks.

 

Blue
Your welcome

 

So I should be concerned about my 2009 ss auto with my current 14mpg city..🤔

 

On the DIC (Driver Information Center) reset your mpg and average mph. Also reset your trip odometer. Drive like you normally do and post those findings back here.

 

I've reset it a few times it's always 13 to14 🤔 car car is stock with exception of air box lid got lost and has k&n filter also has GM stage tune..
Runs fine no service lights step on gas and torque steers like crazy easily leaves 10ft tire Mark's everywhere I have to turn of TC to be able to drive it safely.

 

I've ordered zzp HD cold intake should come in today and I have red coil packs and trifecta tune already I was waiting on intake to install the rest, hoping that helps as it's crazy putting 45.00 in gas twice a week.. it's worse then my old skyline on gas🤔

 

If you're only getting 13-14 mpgs you have an issue of some sort.