I also just completed it.
Another issue:
"What units did you estimate your fuel economy in? "
Most members here report in US gallons, and there's no option to indicate that (survey likely assumes Imperial gallons). You'll have to cross-reference against country of residence and do conversions for US participants.
"I avoid the use of air conditioning in my vehicle"
No option for "Does not apply."
Same for:
"I use park and ride systems where ever possible to avoid traffic"
"The next car I buy will have greater fuel economy"
I indicated "disagree" on this one, which could be misinterpreted as not caring about fuel economy. What my reply means is that my current car is already top of its class, so it's unlikely I'll buy a
more efficient one if I stay with the same type/class.