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Hi its me again, asking a very noob question.

My Dad used Unleaded gasoline for our Civic Esi '95.
But Since the price of unleaded and premium gasoline almost the same now, I would like to try using premium.

My tank is currently 50% filled up with unleaded.

Can I feed premium as early as now?no harmful effect on mixing up?

pls help.thanks

 
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no, actually, mid-grade is nothing more than a mixture of premium and regular, so its really no big deal, its a common myth that u cannot mix gasolines, just the same with synthetic and conventional oil, changing and mixing is no big deal

 
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jus remember you cant jus switch back and forth on the unleaded and premuim gas.. your car will run like **** if you switch back to unleaded once you start using premium gas,, i did that in my previous car i own .... didnt run the same soo i had to use premium gas until my car broke down..

 
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It is imerative that you use premium if you have a VTEC motor. For non VTEC I wouldn't use anything but midgrade. Mixing will not hurt. But once you've run the good stuff,don't switch back to regular.
Hope this helps.