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Easier to take, simpler to program, and more accurate, all at once
Instead of estimating consumption via adjustments to the national average using a list of checkboxes (florescent lights? energy star?) why not have the option to simply put down your exact amount of use?

Anyone who gets an electric bill can easily find out exactly how much power they use. This would mean just one question regarding electricity, as well as a precise amount for the calculations.
If a particular person is using only 50kWhs per month (that's my usage), it doesn't really matter whether the appliances are energy star rated. If someone only rarely uses lights they may use less than someone who has CFL bulbs but stays up until midnight every day.

Similarly, instead of approximating mileage from type of car, have the option of putting in MPG. That would take into account all the variations (except alt. fuels) such as plug-in hybrids or motorbikes. Better yet, if the user knows it, the option to put in the number of gallons of gas they buy in, say, a month, would give the most accurate number, and then there would be no need to ask about total miles driven either.

Many users could do the same for gas and water as well.

Some people may not have access to these numbers, so having the approximating options available is a good idea, but for those of us who do it would make for a shorter and far more accurate quiz.