Same for me - but do a search - this topic has been addressed
My theory is that the DIC disregards idling gas usage.MACATOWA said:I'm tracking mine by DIC MPG, trip miles / gals, total miles. So far total average is 26.5 and the DIC is always reading too high.
I agree. I consistently get numbers at the pump that are right at 2 MPG less that what the DIC indicates. My average to date is 25.4 MPG (based on fuel purchased).I have noticed that while I get roughly the MPG estimates that came with the car based on the vehicle computer, the actual numbers are about 2 mpg lower than the computer.
Okay I will retire the theory that the DIC doesnt count idle gas usage. phsst...gone..Islander said:Couple thoughts on this issue---DIC does in fact figure in usage while at idle. If you've recently reset the MPG DIC indicator, you can watch the MPG go down while sitting at a long redlight so I don't think that's the reason for any discrepancy. I think the "factory" calibration is actually a little optimistic for the DIC. I'm seeing about an averge 1-1.4 MPG difference between the DIC and my Scangauge II which you can actually recalibrate at each fillup. Got 3500 mi on the Terrain now and am getting consistent 27-28 MPG for each tank...about 70% HWY to 30% city. By the way, excluding redlights and stopsigns, the I4 produces amazing mileage in the 30-45MPH range. Only mileage disappointment is when my right foot gets heavy on the Interstate...it really sucks over 70MPH. But the ride and comfort makes me forget that!
Ohh, too bad! I thought it was one of the most inventive theories presented at this forum. I was pulling for it to be true. ;DBy Roesterman: Okay I will retire the theory that the DIC doesnt count idle gas usage. phsst...gone.
Driving like that means nothing (you could just set it in N and floor the pedal ;D).ccharlie said:Just an FYI.
Did a test the past two weeks to see how poor the MPG could get by driving hard.
Used M and constantley ran to 4-5 thousand RPM and sometimes to 6. Down shifted a lot and idled a lot. Just filled up and the result was 17 mpg.
That's good to hear that the engine needs 10,000 to 20,000 miles before it loosens up and maximizes the gas mileage. As I posted earlier in another post, on a recent trip, I was very careful (soft on the gas pedal) for the entire trip and only averaged 25 MPG. This was actual mileage, calculated by dividing miles driven by fuel used. I was dissappointed because I don't intend to drive the interstates at 50 to 55 MPH for the life of the vehicle. I'll just be patient and put some miles on it before getting concerned.bballr4567 said:Guys, unless you have around 10k miles on the motor, its not going to give you the best MPG. Heck, there are some reports the DI engines from GM dont fully get the best MPG until around 20k miles on some Cadillac forums with the HF 3.6 V6. Same with the Camaro.
Having said that, our DIC has always been about 1 MPG too high. On a recent highway trip it was almost dead on. Not sure why but it was.