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Here's some injector pulse widths from my SuperMID with various combinations of accessory electrical loads turned on. It was made after returning home from a 25 mile trip so the engine was completely warmed up. The SuperMID shows the change in pulse width within seconds of turning on the electrical load. Below are the results.
Warm idle with nothing turned on........2.3 to 2.4
Parking lights on..............................2.4
parking and headlights on..................2.6 (high and low beam are the same)
Brakelights on.................................2.4
Fan on lowest speed (level 1)............2.4
Fan on next higher speed (level 2)......2.4
Fan on level 3.................................2.4 to 2.5
Fan at max speed (level 4)................2.5
A/C and fan at level 2......................3.6
A/C and fan at level 4......................3.7
radiator fan on................................2.4
Radio on with volume fairly low...........2.3
I also monitored the pulse width for the 1st minute of idle when starting a cold engine at 55F ambient temp.
Start idle.........4.2
After 30 sec.....2.9
After 1 min.......2.6
When restarting a warm engine with the starter, the pulse width returns to normal within about 5 seconds, when bump starting, the pulse width is back to normal within a second.
From past observations, turning on the headlights drops my mileage by about 2mpg.
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