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The mkiv Supra Owners Club

Half or full tank – Octane deterioration.


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As I only drive my car occasionally and not everyday, what would be the best way to leave the fuel (Shell opti-max) in the car?

 

For the longevity of the fuel tank I suppose a full tank, but in relation to the Octane deterioration over time would this be better in a more compact environment (I am assuming evaporation) ie. full tank,

 

Or,

 

Better leave it half empty/full so that I am re-fuelling with newer fuel rather than topping up older fuel?

 

I would say I use half a tank a week or 2 depending on weather.

 

Many thanks

Stephen V

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