is the blend of light
hydrocarbon fractions of relatively high
antiknock value. Automotive, or motor, gasoline may consist of the
following components: straight-run naphthas,
obtained by the primary distillation of
crude oil;
natural gasoline, which is "stripped", or condensed, out of
natural gas; cracked naphthas; reformed
naphthas; and alkylate. (See alkylation,
catalytic cracking,
reforming). A high-quality gasoline has the
following properties: (1) proper volatility to
ensure easy starting and rapid warm-up; (2) clean-burning characteristics to
minimize harmful combustion chamber deposits; (3)
additives to prevent rust, oxidation,
and deposits in carburetors, intake valves and fuel injectors; (4)
sufficiently high octane number to prevent
engine knock.
Also see aviation gasoline.