As it stands, TrueDelta’s Gas Mileage Survey goes well beyond other such surveys to capture key information about how and where a car is driven. But it could be better still.

Under consideration: questions about fuel type (percent ethanol, biofuel), roof racks, and the date of the fillup. Maybe also questions on mods, so cars with heavy mods can be included. In all cases, these questions would be optional, because the survey is already pushing the length limit for many participants.

So, any comments or suggestions? Would you like to see something added or done differently?