Re: How accurate are the factory installed MPG computers

Posted by Bob on March 01, 2014 at 23:24:45 from (64.255.159.192):

In Reply to: How accurate are the factory installed MPG computers posted by Rkh on March 01, 2014 at 14:36:05:

The vehicle 'puters have NO direct way of knowing the gallons used/temp/specific gravity of the fuel.

There's NO physical flowmeter/MPG meter.

The 'puter ASSUMES the factory flowrate of the injectors, and then factors in the injector duty cycle, and engine speed and comes of with a number that will be accepted by/make the average owner happy.

Some years back some "chip" manufacturers got in trouble 'cuz their software made itself look better/better by reporting better/false MPG with NO improvement at gas pump.

Then, one or two mfg's got in trouble for "tweaking" the odometer readings by a few % high to make their apparent mileage slightly higher.

Bottom line is that the indicared MFG's have NO incentive to make the reading accurate or honest.;

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