My 1998 gas cap says 89 octane and that's what I use. If you're worried about doing damage, the knock sensors won't let that happen. Regardless, that's what the engine is designed for and even with an automatic in our ti and its 4.44 final drive, I never get less than 27 mpg on a tank incuding in-town shopping and school commutes with the OBC showing an average speed of around 30mph. On a recent back country-road trip in traffic averaging about 60mph, computer showed fuel economy of 38.8 which was later verified by gas pump quantity and odometer reading. About the same observed mileage one of the major car mags got in testing a Prius Hybrid in real-world driving. Including about 200 miles on I-95, my average on that trip was 35 mpg. I can drive to DC and back (over 200 miles) and still do my normal commute and kid shuffling for a week on the same tank. |