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As per Mazda's Website, premium unleaded fuel is recommended. http://www.mazdausa.com/MusaWeb/displayPage.action?pageParameter=modelsSpecs&vehicleCode=MX5 It is, I believe, the only Mazda that requires high grade fuel.
Actually, I am using the Unleaded 95 for my Rx 8 (1.3 192CH) 2008. I hope that it's not bad for the RX8 ..
regular unleaded
The 2011 Mazda MAZDA3 runs on regular unleaded.
The 2007 Mazda MAZDA5 runs on regular unleaded.
The 2006 Mazda MAZDA6 runs on regular unleaded.
The 2005 Mazda MAZDA6 runs on regular unleaded.
The 2009 Mazda MAZDA3 runs on regular unleaded.
The 2013 Mazda MAZDA2 runs on regular unleaded.
The 2014 Mazda MAZDA2 runs on regular unleaded.
The 2004 Mazda MAZDA6 runs on regular unleaded.
The 2012 Mazda MAZDA3 runs on regular unleaded.