I'm throwing this one out here in case someone can save Tracy the time of
replying personally - we need him in the shop :)

I burned 43.6 gallons while the EM2 said I burned 45.1
The calibration setting on the EM2 was 156. The manual doesn't cover how
much change to make. Do I simply apply the percentage change and reset it to
151.

 i.e. 156 * (43.6 * 100)/45.1)/100) = 150.81

John (learning the arts of crop spraying)