[basjoos]

One nice thing about the SuperMID is that it displays the injector pulse width so you can instantly see the effect of various loads on engine fuel consumption. About 5 years ago I published a thread showing the effect of various loads on the injector pulse width for my car when it had a 16 valve non-lean burn engine installed in it.

Here are the figures with the lean burn engine.

SuperMID readings in uSec

Baseline
Idle (600 rpm) on warm engine 1.9

Revving engine to 1000 rpm with no load 1.4
Revving to 2000 rpm " " " 1.7
Revving to 3000 rpm " " " 1.9
(Lean burn kicks in to reduce pulse width above idle)

Idle + parking lights 2.0
Idle + low beams 2.1
Idle + high beams 2.2

When driving at 60mph, I lose 1 to 2 mpg when driving with the low beams on, so at 60 mph I'm losing about 1 mpg for each 0.15 increase in injector pulse width.

Idle + Engine cooling fan 2.1

Idle + Cabin cooling fan on 1 2.0
Idle + cabin cooling fan on 2 2.0
Idle + cabin cooling fan on 3 2.1
Idle + cabin cooling fan on 4 2.2

Idle + a/c + cooling fan on 1 3.8
Idle + a/c + cooling fan on 4 4.0