99.9 MPG...Possible?
Senior Member
Joined: 02-12-2006
Posts: 847
From: Space Coast, FL
Originally Posted by SoCalHHR
The computer calculates mileage based on current speed, average speed, distance traveled, throttle position, and TIME since the last reset.
Based on those factors, you can easily see why it will read 99.9 (it's numerical limit), when resetting the DIC while going downhill at say 65mph with your foot off the gas.
This also explains why the DIC goes "crazy" after a reset at highway speeds. It is simply trying to play "catch up" with all the data that is rapidly changing (distance traveled, averaging the speed against time since reset, and averaging the mileage). If it didn't change quickly it wouldn't be very accurate.
I have done the math on several tanks of gas and found the DIC to be extremely accurate regarding mileage. Looks like GM really did their homework on this one!
Based on those factors, you can easily see why it will read 99.9 (it's numerical limit), when resetting the DIC while going downhill at say 65mph with your foot off the gas.
This also explains why the DIC goes "crazy" after a reset at highway speeds. It is simply trying to play "catch up" with all the data that is rapidly changing (distance traveled, averaging the speed against time since reset, and averaging the mileage). If it didn't change quickly it wouldn't be very accurate.
I have done the math on several tanks of gas and found the DIC to be extremely accurate regarding mileage. Looks like GM really did their homework on this one!
to GM on this feature
Deceased
Joined: 10-03-2005
Posts: 2,351
From: Sachse, TX NE Dallas
Originally Posted by CSHTOM
To get the gauges to show 99.9 MPG. That is no big deal. Just get on a long downhill don't step on the gas pedal and reset the guage.
The real question is how long did you maintain the 99.9 MPG once you stopped going down hill.
The real question is how long did you maintain the 99.9 MPG once you stopped going down hill.
it was a ways
Senior Member
Joined: 02-12-2006
Posts: 847
From: Space Coast, FL
Originally Posted by PhxHHR
Yeah, my DIC is balls-on accurate....... 
Dare I say, here we go again..... all of us bragging about our DICS......
Dare I say, here we go again..... all of us bragging about our DICS......
New Member
Joined: 05-15-2006
Posts: 20
From: DFW
Originally Posted by dan-d
Hmmmm, were actually bragging about GM's DIC....hahaha
