Measuring output
You will need your generator, a bottle, a bucket or something similar and a watch. Fill the bucket halfway with water, fill the bottle with water. Turn on your generator, take the hose and put it in the bottle of water. Get your watch ready and flip the bottle and hose over and place into the bucket of water. Time the amount of time it takes for the gas to force the water out of the upturned bottle. If you use a standard coke bottle it about 590 ml. If it takes a minute to fill the bottle with gas, then its about .5L per minute.
2006 Ram, 5.9 cummins HO. 4 cell design, 1.5 LPM@30amp, 24.3 MPG