this might be a dumb question, but who cares. I have a 94 dohc vtec del sol and it says unleaded fuel only. My brother's prelude and integra gsr are basically the same engines(dohc vtec), and for them it says premium only. Do i have to use unleaded or is premium the one to go with. All dohc vtec sol's say unleaded fuel only which strikes a sense of aw to me.