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I deleted the circuit.
I deleted the comparator circuit. I went with the Jcar module. It works much better and I built it and it works! Only $30.00 from Australia.
I am still having fun trying to calibrate the MPGuino. My rig is a large motor home with a 75 gallon tank, now at 1/4 tank, it will take $264 to fill it up. A 40 mile round trip calibration run at about 11 mpg = 3.63 gallons X $4= $14.62 per run. Gettin' kind of expensive.
The best mileage is on a very long drive of 300 miles on the expressway. Drive a very slow 53 mph. Coast on all down hills. Accelerate as quickly as you can so the tranny up shifts quickly. That sounds crazy, but every time the tranny shifts up the fuel usage drops 1-2 mpg. Hey, it starts at 1.5 mpg in low gear. The good mpg starts at 45 mph. Town driving will get ya 5 mpg!
Cheers
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