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Hi there, have recently purchased a 2010 2.5 litre mazda 3. Car dealer said I could use 91 or 95 octane fuel. Which do you recommend?

Hi there,
Most modern Japanese cars can run on either fuel, with little noticeable difference between the two. I suggest trying both and seeing if you experience better performance in the area you travel with 91 or 95, generally the higher price of fuel out ways any power benefits gained.
The higher octane fuel is generally more a requirement for turbo charged and performance vehicles.

Great! Thanks for the suggestion.