In fact, the 600-page report, released Thursday, found that hitting those fuel targets of a corporate average of 54.5 miles per gallon could most likely be done without as much difficulty as the industry had feared. For years, the industry has warned that the goals will be all but impossible to meet without widespread adoption of zero-emission technologies like electric cars. While the study focused primarily on midsize vehicles, it concluded that existing technology like 8-speed transmissions, advanced turbochargers and lighter materials were most likely enough, on their own, to allow automakers to meet the 2025 standards. Electric or fuel-cell vehicles might still be bonuses for automakers, but they were unlikely to be necessary to reach the goal.