| http://www.w3.org/ns/prov#value | - http://www.arb.ca.gov/msprog/aftermkt/aftermkt.htm#altfuel Alternative Fuel Certified Retrofit Systems Under current California regulations, conversion of emission-controlled vehicles with retrofit systems to operate on alternative fuels, such as propane and natural gas, in lieu of the original gasoline or diesel fuel is only allowed if the retrofit systems have been evaluated and certified by the
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