> wrote in message
oups.com...
> Hello all,
>
> My 1991 Miata, just never quit pinging (rattle noise), my mechanic
> suggested to fill up with premium gas for a while and add Chevron
> Techron, I did that but pinging is still there, with the current gas
> price I really want to go back to regular gas, any ideas, suggessions
> please.
>
> Abid
>

My '96 has always pinged (panged? pung?) on 87 octane but not on 91.