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.