SG wrote:

> Hello!
>
> I recently bought a Honda Civic Hybrid 2005 and its User Manual says
> that "Gasoline Grade should be 86 or higher", which means any grade
> above 86 which could be "Regular 87", or "Mid-Grade 89" or even
> "Premium 93" can be used, as I understand. If I use "93 Grade
> Gasoline", will it do any harm to the engine? What are the pluses and
> minuses in using the "93 Grade"? What would you recommend and why?
>
> I thank you for your time and will appreciate your advise.
>
> Regards,
> SG

Just use the "Regular 87". Using higher octanes won't harm the engine, but
it will definitely harm your wallet.