Quote:
Originally Posted by Daox
Using a scangauge as gospel for MPG... yeah, thats not gonna work. Its not even calibrated.
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Good catch guys.
The lack of calibration is exactly why we never said what mileage we got on those tests, only what the difference was. You can still measure differences without calibration, but you can't believe the absolute values. Besides, the absolute fuel economy at cruise at 60 mph doesn't mean much anyway.
We've run plenty of fuel through this thing, but sometime during each tankfull we have to either unplug the Scan Gauge to plug in the aligator, or we have to change a fuel filter and lose all the fuel that was in it, so calibration was never possible.
Plus, changing the injectors changes the calibration, which is why we couldn't say whether the injector change helped our FE.
Just so you know, we have been filling the tank all the way up the filler neck so we know exactly how much fuel we have. Just going until the pump shuts off isn't very precise (we put in 2.5 gallons after shutoff once), so if you're calibrating your scan gauge that way, you're fooling yourself.
-Dave Coleman