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how does the dic get the gallons used. Can somebody explain how the dic says onething and the amount put in tank will be 3 to 4 gallons different
 

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If I'm correct, It is figured by a formula using Miles per hr and speed traveled. But, I'm sure I'll probably be corrected.
 

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hope this helps direct from gm si

Driver Information Center (DIC) Description and Operation

<A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=828851&evc=sm&pubid=437&cellId=51541&mspsdsubkey=2939#ss1-828851">Driver Information Center (DIC)

The driver information center (DIC) consists of a single line 22 character vacuum fluorescent (VF) display placed in the lower center area of the instrument panel cluster (IPC). The DIC will display vehicle information, configuration, and warning parameters to the driver.
The display parameters are cycled, changed, and acknowledged using 4 DIC buttons.
Trip Information Button representation icon appears as a road to the horizon.
Fuel Information Button representation icon appears as a gasoline pump.
Personalization Button representation icon appears as a human next to vehicle.
Select Button representation icon appears as an arrow.​
<A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=828851&evc=sm&pubid=437&cellId=51541&mspsdsubkey=2939#ss2-828851">DIC Displays

The DIC parameters are displayed by order of priority as follows (from highest to lowest) :
Service Diagnostics
Driver Identifier
Feature Programming
Driver Warnings
Vehicle Information​

Vehicle Information Vehicle information provides feedback to the driver on vehicle performance, mileage, maintenance, or related information.
Vehicle information can only be displayed with the ignition switch in the RUN position.
When the English/Metric status changes, any applicable vehicle information data values will also change.

DIC Trip Information / Reset Capabilities The available DIC Trip Information and reset capabilities are as follows:
Odometer - Cannot be reset
Personal Trip Odometer - Can be reset
Business Trip Odometer - Can be reset
Timer - Can be reset
Hourmeter -- Cannot be reset​

Trip Reset Stem The trip reset stem on the IPC operates in the following manner with the ignition switch in the RUN position:
  1. <LI type=1>Each time the trip reset stem is pushed the display will cycle to the next trip parameter. The trip parameters are as follows:
    - Odometer
    - Personal Trip odometer
    - Business Trip odometer
    - Timer
    - Hourmeter​
    <LI type=1>Holding the trip reset stem for greater than 1 second or depressing the SWC Select button while either Personal Trip or Business Trip odometer is displayed will reset the displayed trip odometer and all other corresponding trip parameters to 0.0 upon release of the stem. The trip odometer will remain displayed after being reset . <LI type=1>If a trip information parameter is being displayed, pressing the DIC Trip Information button will display the next trip information parameter.
  2. If the next Trip Information parameter to be displayed is Timer, Hourmeter, or blank, pressing the reset stem will return the display to the Odometer.
Odometer The odometer is capable of displaying values from 0 - 999,999 mi or km.
If the ignition is in the OFF or UNLOCK/ACC position, the odometer can be displayed by pressing the trip reset stem. The odometer will remain displayed for 5 seconds.

Trip Odometers The DIC can display Personal Trip or Business Trip odometers.
The trip odometers are capable of displaying values from 0 - 999999.9 mi or km.
When the maximum value is reached, the trip odometer will roll over to 0.0.

Timer The Timer is displayed as XX (hours) : XX (minutes) : XX (seconds).
The Timer is started and stopped using the DIC Select button.
Holding the Select button for longer than 1 second while the Timer parameter is displayed will reset the Timer to 00:00:00.
The Timer status and data value is retained in memory when the ignition is turned OFF. When the ignition is turned ON again, the Timer status and data value is resumed.
The Timer maximum value is 99:59:59. When the maximum is reached, the Timer rolls over to 00:00:00 and continues to operate.
<A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=828851&evc=sm&pubid=437&cellId=51541&mspsdsubkey=2939#ss3-828851">Fuel Information


DIC Fuel Information / Reset Capabilities The available DIC Fuel Information and reset capabilities are as follows:
Range - Can not be reset
Avg. Fuel Economy - Can be reset
Inst. Fuel Economy - Can not be reset
Engine Oil Life - Can be reset​

Range The range display is the estimated distance that the vehicle can travel under current fuel economy and fuel level conditions.
This range is calculated from odometer information and class 2 messages.
Fuel Range is capable of displaying values from 0-999 mi or km.
Display appears as: RANGE: XXX MILES (English), RANGE: XXX km (Metric).
If the range is less than 40 miles, RANGE: LOW will be displayed.

Average Fuel Economy The Average Fuel Economy (AFE) value is calculated by the cluster based on Trip Distance and Trip Fuel Used.
Pressing the Select button for longer than 1 second while the Average Fuel Economy is displayed in the DIC will reset to 0.0.
Average Fuel Economy is capable of displaying values from 0.0-99.9.
Display appears as: AVG ECON XX.X (English) MPG, AVG ECON XX.X L/100km (Metric).
Trip Distance and Trip Fuel Used accumulated values are stored in memory when the ignition is turned OFF.

Instantaneous Fuel Economy Instantaneous Fuel Economy values are calculated by the cluster from odometer information and class 2 messages.
The cluster calculates instantaneous fuel economy based on distance and fuel.
Instantaneous fuel economy is capable of displaying values from 0.0 - 99.9.
Display appears as INST ECON XX.X (English), INST ECON XX.X L/100km (Metric).
Values for the Instantaneous fuel economy are not stored when the ignition is turned OFF.

Engine Oil Life Engine Oil Life percentage values are based on class 2 messages to the IPC. The IPC requests this value when Engine Oil Life is selected on the DIC.
Engine Oil Life is capable of displaying values from 0-100 percent and the OIL LIFE RESET driver warning will be displayed.
Pressing the Select button for longer than 5 seconds while Engine Oil Life is displayed on the DIC the value will reset to 100 percent.
Display appears as ENGINE OIL LIFE: XXX%.
<A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=828851&evc=sm&pubid=437&cellId=51541&mspsdsubkey=2939#ss4-828851">Feature Programming

Refer to Personalization Description and Operation in Personalization.

Driver Warnings For the list of Driver Warnings, refer to Indicator/Warning Message Description and Operation .
 

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I believe that Gals used is calculated by how many times the injectors fire. It knows how much each shot is and how many shots are made.
 

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I believe that Gals used is calculated by how many times the injectors fire. It knows how much each shot is and how many shots are made.
I don't think it works this way because my truck is ALWAYS a minimum of 2 gallons off up to 4 gallons off every tank.

If it measured pulse/shots, it should be a heck of a lot more accurate then being almost 20% off.
 

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mine is always pretty damn accurate with the stock tune "within .5 gallons". But of course the tuner throws it all out of wack
 

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It's due to the calibration of the flow amount for each injector vs how many miles traveled to get a MPG reading. It then compares it to how many gallons it thinks is left in the tank via a fuel level sensor. Not every truck performs the same and GM doesn't calibrate every truck specifically to its injector volume usage. When you add a reporgrammer or power module to the system the calibration is even farther off. Make sense?
 

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I did an oops :eek:: I hope it didn't show up. Anyway, your tire size may have something to do with it.
 

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ramwheel,

I noticed in your signature that you're using a Westers MPG tune. How do you like it? What kind of mileage numbers are you seeing? Any effect on power?

Joseph
 

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Discussion Starter #12 (Edited)
Joseph
So far its done everything they said. On a 1,000 mile trip it averaged 23mpg that included some city mostly freeway driving with cruise set at 68-69 mph and tach just under 2 grand. Just by seat of pants drives like night and day difference and really quick(don't know about now much hp otherthan they said between 75 - 90 hp). It was fun to drive before now its a real treat ,worth every penny spend (still some in the bank)
 
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