Virginia Maclaren described sustainability indicators as means for measuring a communities progress toward sustainability. In the urban setting, indicators must be developed with input from multiple stakeholders in the community. In addition, urban sustainability indicators must be integrated, forward-looking and distributional.
Some examples of indicators include: number of good air quality days per year, gallons of water consumed per capita, and library and community center usage rates.
In Bloomington, a sustainability indicator could be a measure of the number of people who travel via the transit system. This would affect the amount of gasoline consumed per capita. While I can't say what this percentage is before, I know that I have lived in bloomington for a month now and have personally not used more than an 1/4 tank of gas from my personal vehicle. I know many of my friends have opted for using the bus rather than deal with the traffic and parking issues. The use of the public transportation system fits with the 'population and resources' section in figure 1: sustainable seattle indicators. This is only an indicator if the gas usage is going down, which I think it has in Bloomington based on my personal experience.
Bloomington has bus ridership that rivals Indianapolis. Unfortunately, as you suggest, we don't have much information on other types of transportation in the current indicators. The Peak Oil Task Force Report contains more information, including some amazing statistics about how much fuel commuters in Monroe County use in their personal vehicles. You are an exception: https://bloomington.in.gov/peakoil
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