Question about 1999 Mazda MX-5 Miata
Mazda says it recommends premium and it will idle smoother on premium and have more power. The economy being tight and gas prices high people want to economize. The 1.8 will run well on regular 89 octane, but may ping on hard acceleration at first until the knock sensor picks this up and the computer retards the timing a bit. I have even run 3/4 tank E85 + 1/4 tank premium with only a slight power deficiency and reduced mpg. That was only an experiment to see how it would run if the government increased ethanol percentages in pump gas, which they are rumored to do. It suffered no ill effects but I don't recommend it for daily use, in an emergency perhaps.
Posted on Jun 05, 2011
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Posted on Jan 02, 2017
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