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Originally Posted by blinkwatt
How are you basing this 19mpg? I've found that the OBC isn't accurate 90% of the time and it's better if you track your mpg on your own. My OBC tells me I'm pulling 20mpg most of the time but by trackign my mileage-to-gallons of gas I'm pulling in higher than that.
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I wish I had the OBC mpg readout. I'm basing my mpg on amount of fuel at each fill-up and the miles traveled since the last fill-up. This number has been pretty consistent over the last, say, 10 fill-ups or so.
I had the OBC mpg readout on a 93 BMW 325is and it was usually fairly accurate compared to the real world, do-it-yourself calculation at the pump at each fill-up - but it was important to reset the computer mpg calculator at each fill-up to make a valid comparision.