1973-02-01

Road Rating Trends of United States Motor Cars - A Review of Recent CRC Programs 730012

A review of the CRC road rating programs conducted between 1952 and 1971 indicates that:

1.
Equations based on RON and MON are satisfactory for predicting the road octane numbers of gasolines.
2.
MON has become more important and RON less important in prediction equations.
3.
Variables such as percent aromatics, Pb concentration, and DON are not broadly significant and improve RON/MON equation predictions only in restricted applications.
4.
Car appreciation of low-sensitivity fuels has increased, while appreciation of high-sensitivity fuels has decreased.
5.
Road octane response to increase in laboratory octane quality has decreased.
6.
Variability of Road octane testing and predictions have remained substantially constant over the past 20 years.
7.
Because of variability considerations, measurements of road versus laboratory octane relationships and estimates of car satisfaction are subject to significant errors.

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