Fleet operators and ARB staff investigated any problems found in both test and control vehicles. The test program did not find any problems in the test vehicles that could be attributed to the fuel. All fleet managers found that their vehicles performed as well on cleaner-burning gasoline as on current fuels. A small reduction in gas mileage can be expected in most motor vehicles, which is discussed below. Representatives of oil refiners and automakers worked with ARB staff to oversee the test program.
Major automakers endorse the use of cleaner-burning gasoline in their vehicles.
Use of cleaner-burning gasoline will not affect vehicle warranties. Gas Mileage Gasoline mileage with cleaner-burning gasoline will average 1 to 3 percent less than with current and past fuels. This is due to the addition of oxygenates and the reduced level of heavier hydrocarbons. This causes a slight reduction in the energy content of the fuel. Service stations are expected to switch directly from these oxygenated fuels to cleaner-burning gasoline.