C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

MPG display

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Old Feb 1, 2005 | 07:08 PM
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From: Norton ma
Default MPG display

Hows is the MPG calculated on the dash? The only thing I can think of is that it is tied to injector pulse width from the ECM??

Has anybody maintained this gauge with an aftermarket ECM such as megasquirt??

84 vette BTW.
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Old Feb 1, 2005 | 07:28 PM
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The MPG readout is calculated with a firmware algorithm in the CCM using the pulse width of the injectors vs. distance traveled or vehicle speed respectively for the "Average MPG" or "Instant MPG".
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Old Feb 2, 2005 | 03:23 AM
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In my experience it is worthless once the engine has been modified. It has become very optomistic in my car. However in my 04 Silverado it is almost correct.
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Old Feb 2, 2005 | 04:01 AM
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Originally Posted by 350ws6
Hows is the MPG calculated on the dash? The only thing I can think of is that it is tied to injector pulse width from the ECM??

Has anybody maintained this gauge with an aftermarket ECM such as megasquirt??

84 vette BTW.
Mine worked well until I changed out the injectors. Now it reads 2.5 mpg high.
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