Do higher and higher gas prices spell doom for our suburbs?  Well some experts think the answer is yes.  This is because they believe that the higher gas prices signal that we are running out of oil, thus forcing more people to both drive less and live in the cities.  But according to a study by the National Center for Policy Analysis, such assessments are running on empty.  To begin, the study notes, geologists insist we have plenty of known reserves for oil, and higher gas prices may increase the sales of fuel efficient cars, numbers of telecommuters, or even move more businesses to the suburbs instead of workers to the cities.  So it appears the foreboding predictions of gloom for our suburbs may be full of Big City hype.