The pilot was flying a round-robin flight from Cottonwood, AZ to Page, AZ, and return. The pilot had landed at Page, AZ. While on the return leg of the flight, the pilot noted his fuel gauges were 'low' and diverted to Flagstaff, AZ. When the aircraft was northeast of Flagstaff Airport, the aircraft sustained a total loss of power. While negotiating an emergency landing to a road, the pilot observed unmarked powerlines that crossed the road. When he attempted to 'pull up over the powerlines,' the aircraft stalled and subsequently collided with the ground. The post-accident examination of the wreckage disclosed no evidence of any fuel. The exact aircraft flight time could not be determined. Fuel consumption calculations based on the pilot's stated route of flight and takeoff and landing disclosed the aircraft should have consumed 20.8 gallons of fuel. The aircraft has 22.5 gallons of usable fuel. The calculations assume optimum weather conditions and pilot techniques.