Originally Posted By: DrDusty86
A friend has a 09 Pontiac G5 with a 2.2L ???? Ecotec. Sorry my gm knowledge is lacking. She has a 70mile round trip commute. It only gets 24mpg avg. She Runs AC/ Cruise set at 70mph. Its ALL hiway. Could I use 0w20 or 5w20? I know GM says 5w30 for the car but I want to help her fuel milage. ALSO, the dealer set her tires at 27.5psi..seems low, tire sidewall says 35psi MAX. I was looking at 32psi to help boost it as well, is that ok ????
Please Help,
Dusty
Car: 09 Pontiac G5, Auto, 50k miles, dealer serviced currently.
For all that you said above it sounds like 24 MPG is about right. There are minor things you can do that will definitely help MPG (that have been proven).
1 - Higher tire PSI, I think its 40-45+ PSI. Mythbusters proved this to be true but dangerous.
2 - Acetone added to your fuel tank. Not recommended at all. But it does help with MPG.
Last but not least, the best way to improve MPG, is to drive slower. I believe there were some numbers out there to prove that drag on a car gets worse for every 5 MPH you go and it gets dramatically worse over 55 MPH.
I didn't really believe that going 55 MPH vs going 65 MPH on a highway for long periods could result in HUGE increase in MPG. I put it to test one day a few summers ago in my 2003 Saturn Vue V6 AWD.
I live about an hour and a half from St. Paul, MN. Filled to full, reset the trip odometer and set the cruise to 65 MPH. I got my regular 27 MPG on the highway.
On the return trip I did the same at 55 MPH and got 35 MPG.
Yes, it took longer to get back home, about 20 minutes more.
Yes, people passed me on the highway (they prolly thinking, [censored] Asians.... lol).
But #1 way to improve MPG, driving slower.
A friend has a 09 Pontiac G5 with a 2.2L ???? Ecotec. Sorry my gm knowledge is lacking. She has a 70mile round trip commute. It only gets 24mpg avg. She Runs AC/ Cruise set at 70mph. Its ALL hiway. Could I use 0w20 or 5w20? I know GM says 5w30 for the car but I want to help her fuel milage. ALSO, the dealer set her tires at 27.5psi..seems low, tire sidewall says 35psi MAX. I was looking at 32psi to help boost it as well, is that ok ????
Please Help,
Dusty
Car: 09 Pontiac G5, Auto, 50k miles, dealer serviced currently.
For all that you said above it sounds like 24 MPG is about right. There are minor things you can do that will definitely help MPG (that have been proven).
1 - Higher tire PSI, I think its 40-45+ PSI. Mythbusters proved this to be true but dangerous.
2 - Acetone added to your fuel tank. Not recommended at all. But it does help with MPG.
Last but not least, the best way to improve MPG, is to drive slower. I believe there were some numbers out there to prove that drag on a car gets worse for every 5 MPH you go and it gets dramatically worse over 55 MPH.
I didn't really believe that going 55 MPH vs going 65 MPH on a highway for long periods could result in HUGE increase in MPG. I put it to test one day a few summers ago in my 2003 Saturn Vue V6 AWD.
I live about an hour and a half from St. Paul, MN. Filled to full, reset the trip odometer and set the cruise to 65 MPH. I got my regular 27 MPG on the highway.
On the return trip I did the same at 55 MPH and got 35 MPG.
Yes, it took longer to get back home, about 20 minutes more.
Yes, people passed me on the highway (they prolly thinking, [censored] Asians.... lol).
But #1 way to improve MPG, driving slower.