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Drove the family up to Niagara Falls, Ontario (!). Along the way, gathered a few tank fills of data. Again, not strictly A-B-A, but the results are nonetheless telling.
May 11 - 363.8 miles - 19.113 gallons - 55.4 MPH average speed - 19.0 MPG (12.360 L/100km)
May 12 - 410.4 miles - 20.517 gallons - 57.0 MPH average speed - 20.0 MPG (11.759 L/100km)
That's a 4.9% increase.
Unfortunately, I did not have the time to install the blocking plates that I had wanted to make.
The intake heater, as installed, appears to give a reliable 45 F delta T between the outside air temperature (measured by the overhead display) and the intake air temperature (measured by ScanGauge II), when the truck is moving level at 72 MPH. Inclines and changes in vehicle speed change this delta T.
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