MPG changing from Turning off to Turning On
#1
MPG changing from Turning off to Turning On
Last night while I was in my my driveway at home I was at 53.3 MPG I turned off the car for the evening and when I started the car this morning I was 52.9 MPG. I lost .4 MPG just sitting.
Has this happened to anyone else?
Has this happened to anyone else?
Last edited by lars-ss; 11-16-2005 at 02:02 PM. Reason: spelling
#2
Re: MPG changing from Turning off to Turning On
It's explainable.....the FCD refreshes itself every 6 seconds, or about 10 times a minute.
So when you stopped, it was in "mid-refresh" in that six seconds before it was going to re-paint 52.9, but you turned the car off.
So when you turned it off, it resumed the incomplete refresh that was interrupted and updated you to 52.9
Same thing has happened to me at stoplights - I will stop and the car will go to AutoStop, then a few seconds later the FCD will change, and that was just because it was in the middle of an update cycle when I stopped.
So when you stopped, it was in "mid-refresh" in that six seconds before it was going to re-paint 52.9, but you turned the car off.
So when you turned it off, it resumed the incomplete refresh that was interrupted and updated you to 52.9
Same thing has happened to me at stoplights - I will stop and the car will go to AutoStop, then a few seconds later the FCD will change, and that was just because it was in the middle of an update cycle when I stopped.
#3
Re: MPG changing from Turning off to Turning On
You'll also notice that while the FCD updates every six seconds, you get a lot more variation (i.e. activity) earlier in the tank than later. Just after I reset the computer (after a fillup), I can sit at a stoplight and watch my MPG drop just from the idling. Regardless of where I'm at in a tank, I always seem to loose .4 MPG just starting the car in the morning.
#5
Re: MPG changing from Turning off to Turning On
Originally Posted by Tim
You'll also notice that while the FCD updates every six seconds, you get a lot more variation (i.e. activity) earlier in the tank than later. Just after I reset the computer (after a fillup),
Erik
#7
Re: MPG changing from Turning off to Turning On
It's crushing when you have to work for your entire commute just to get back to the MPG you had when you pulled in the night before. Sucks.
#8
Re: MPG changing from Turning off to Turning On
To make matters worse I have built my MGP upto 53.7 and for the last 3 days I have been driving almost nothing but city, and down the MPG goes.
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