87 octane would be the minimum but 91 would be more ideal.
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The 1994 Honda Prelude is best run with 91 octane fuel or higher. The vehicle is designed for use with high octane fuel.
Regular should work just fine. If you hear it knock a little, then use super.
87 Octane
regular fuel will do. 89 octane
I had an 1986 Honda shadow VT1100 (loved it) and I ran mid grade with no problems. You can run 87 octane with no problems.
87 octane regular
87 Octane Regular.
87 octane unleaded. There is no benefit to running higher octane fuel in the VLX. The only caution is fuel with a heavy ethanol content as the ethanol can attract water when sitting for a while which will cause problems with the carburetor. (Personal experience.)
According to my service manual, 87 Octane (Regular Unleaded) is recommended.
Regular Unleaded 87 octane.