SGII, what inputs does it use to compute MPG?

[gone-ot]

...on our Cruze LTZ, it seems to be simple:

MPG = MPH ÷ GPH

...because the totalized-gallons value is where the "error" seems to lie, because the totalized-miles value always coincide with the TRIP#1 (and #2) numbers.

[PaleMelanesian]

Originally Posted by hummingbird

Hey, one doubt here:

If MGuino MEASURES the injector pulses and integrates them, whereas SGII just 'guesses' about the fuel being used, I would expect MPGuino to be more accurate. Is this conclusion correct?

Also, what is the strategy the in-built FE meters in the new generation cars use? SGII one, or straight computation of fuel a-la MPGuino from the ECU itself?

Yes, but... with the SG calibration feature you can make it very close to accurate. Mine has given less than 1/2 gallon TOTAL error over the last 2 years.

[cfg83]

hummingbird -

Originally Posted by hummingbird

Hey, one doubt here:

If MGuino MEASURES the injector pulses and integrates them, whereas SGII just 'guesses' about the fuel being used, I would expect MPGuino to be more accurate. Is this conclusion correct?

Also, what is the strategy the in-built FE meters in the new generation cars use? SGII one, or straight computation of fuel a-la MPGuino from the ECU itself?

Yes (good question). Each gizmo has it's benefits and detractions. The SG is plug-and-play for any 1996 or newer car. The MPGuino requires splicing into wiring and has it's own calibration process, but it is more accurate and can work on all fuel-injected cars.

CarloSW2