Did you know that Rubis Pure 89 exceeds the Octane requirements of most cars? ….And that Rubis Pure 93 Premium fuel is the highest octane gas available on the whole Island! Use Pure 93 if you want better performance and fuel economy. Now at the Rubis Eastern Ave. Gas Station, you can receive 5% OFF your Gas purchase when you use your free Cayman Coupon from your phone. Take a screen shot- then show it to the cashier at check out and take a screen shot. Then show it to the cashier at Check out. It’s that easy!