Assertion: oil company | /r/CapableOf | switch to leaded gasolines
Facets:
value: en masse
type: MANNER
Source sentences:
text: While most oil companies were switching to leaded gasolines en masse during the mid-to-late 1920s, American Oil chose to continue marketing its premium-grade "Amoco-Gas" (later Amoco Super-Premium) as a lead-free gasoline by using aromatics rather than tetraethyllead to increase octane levels, decades before the environmental movement of the early 1970s, led to more stringent auto-emission controls which ultimately mandated the universal phase out of leaded gasoline.