Lower MPG om high octane fuel? - Toyota Yaris Forums

Johan007 · 10-06-2009, 07:00 AM

I have the 2002 model 100% standard.

I get 42+ MPG with standard fuel (95ron) driving a mixture of dual carriage ways, traffic jams and blasting it once per journey.

Strangely high octane fuel reduces my MPG to 38 on the same mundane journey to work and back!

I check my MPG on a fuel calculator and it is accurate to half a decimal place (as long as miles recorded on the trip computer is accurate), so why does high octane fuel reduce efficiency by so much in this engine when it should get better or at worse same MPG? I would have thought being a "sporty" car it would be tuned for high octane feul.

10-06-2009, 07:00 AM	#1
Johan007 Drives: 2001 Yaris T-Sport Join Date: Sep 2009 Location: UK Posts: 2	Lower MPG om high octane fuel? I have the 2002 model 100% standard. I get 42+ MPG with standard fuel (95ron) driving a mixture of dual carriage ways, traffic jams and blasting it once per journey. Strangely high octane fuel reduces my MPG to 38 on the same mundane journey to work and back! I check my MPG on a fuel calculator and it is accurate to half a decimal place (as long as miles recorded on the trip computer is accurate), so why does high octane fuel reduce efficiency by so much in this engine when it should get better or at worse same MPG? I would have thought being a "sporty" car it would be tuned for high octane feul.

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