if you're planning to export your data and do ranged averages in a spreadsheet or something, i would reccommend just driving it as diversely as possible, and get a TON of data. averages work better with a crapload of data to work with.

alternatively, you can try to cover as much of the ve table as possible by having the laptop mounted somewhere you can see it with data tracing or something enabled.... and try to hold as much time in as many cells as possible.

most people dont realize how consistent they are when driving; if you are driving normally you probably cover about 20% of the VE table, even when you think you're all over the place