31. Q : Faced with high fuel costs, could motorists realize some savings by mixing octane ratings ? 32. There are other products in the alkylate effluent, however, so the octane rating will vary accordingly. 33. This increased resistance to thermal breakdown, much as these isomer types improve octane rating in piston engines. 34. By 1986, a version of this with became available; it needs fuel with a higher octane rating . 35. Here in Ottawa, Canada, the highest octane rating of most gas stations is only 91 or 93. 36. For example, isooctane results from combining butylene with isobutane and has an octane rating of 100 by definition. 37. Knocking can be reduced by increasing the gasoline's resistance to autoignition, which is expressed by its octane rating . 38. They are not designed to adjust to the octane rating , but might have that effect to a limited extent. 39. He then began work at the Ethyl Corporation where he came up with the concept of the octane rating . 40. New Zealand's unleaded petrol was of a low octane rating , meaning that initially only uncatalyzed cars were on offer.
