Ben I was thinking about this the other day. By not entering all your data, you're only fooling yourself and others really. People who want to compare real world data and research fuel economy will be disappointed if people select and choose only their "best" tanks, and leave out the low economy ones. It's cheating the system really, and people will get a skewed idea of what cars actually achieve in the real world. It's all or nothing really, honesty is key.