31.69 mpg with 93 octane
05-14-2009, 11:08 AM
#34
Senior Member
Join Date: 01-02-2008
Location: Nashville, TN
Posts: 1,529
Guess I'm lucky. I average 29.5 during the week in my daily commute (23 miles each way, combination of city street and interstate, occasional stop-and-go in the morning, but consistently half the commute home is stop-and-go). Not bad from what I see others getting.
05-22-2009, 06:57 AM
#35
Senior Member
Join Date: 11-14-2007
Location: Planet Earth
Posts: 1,240
I have a 2007 2LT HHR (2.4L engine). To increase performance AND gas mileage, I replaced the factory air intake with a CGS/K&N air intake system. (took all of 30 minutes to install) and a CGS muffler. Then I re-set the ECM. I have better performance (than when the vehicle was new) and achieve 41.5 MPG @ 55 MPH (level ground) and 36.5 MPG (again @ 55 MPH) on the hilly freeways of Maryland.
Fuel: Supreme (91 octane)
Tires: Michelin Pilot AS
Oil: Mobil 1
Fuel: Supreme (91 octane)
Tires: Michelin Pilot AS
Oil: Mobil 1
05-23-2009, 08:24 AM
#38
New Member
Join Date: 02-02-2009
Location: Dayton, Ohio
Posts: 19
The best I have seen was a 200 mile trip from Medina to Dayton. Set the cruise at 70, windows up with no air (cool day), and the computer said 31.6 mpg. I filled up and calculated it by hand, and it actually got 34.3. Around town it seems to be getting 24-26mpg. all on 89 octane gas. My trip computer seems to consistantly register 1-2 mpg less than it actually is getting.
05-25-2009, 12:54 PM
#39
Hmm...for some reason I seemed to do really good yesterday!
I drove a total of 313.6 miles, with a DIC reading of 30.2. That includes some city driving in Hillsdale. Going down I drove 146.2 miles at 70mph most of the way, and got 31.1 according to the DIC. All expressway driving was cruise set at 70mph, and country driving was between 55mph-60mph.
I will fill up tomorrow or the next day, and I will calculate by hand to see how accurate the DIC is...
I drove a total of 313.6 miles, with a DIC reading of 30.2. That includes some city driving in Hillsdale. Going down I drove 146.2 miles at 70mph most of the way, and got 31.1 according to the DIC. All expressway driving was cruise set at 70mph, and country driving was between 55mph-60mph.
I will fill up tomorrow or the next day, and I will calculate by hand to see how accurate the DIC is...
05-25-2009, 02:31 PM
#40
Senior Member
Join Date: 03-14-2009
Location: Youngsville, North Carolina
Posts: 262
Hmm...for some reason I seemed to do really good yesterday!
I drove a total of 313.6 miles, with a DIC reading of 30.2. That includes some city driving in Hillsdale. Going down I drove 146.2 miles at 70mph most of the way, and got 31.1 according to the DIC. All expressway driving was cruise set at 70mph, and country driving was between 55mph-60mph.
I will fill up tomorrow or the next day, and I will calculate by hand to see how accurate the DIC is...
I drove a total of 313.6 miles, with a DIC reading of 30.2. That includes some city driving in Hillsdale. Going down I drove 146.2 miles at 70mph most of the way, and got 31.1 according to the DIC. All expressway driving was cruise set at 70mph, and country driving was between 55mph-60mph.
I will fill up tomorrow or the next day, and I will calculate by hand to see how accurate the DIC is...