Is the computer smart enough to know what kind of fuel the engine is consuming? Reason I ask, is that I've been putting the low grade 89 into the vehicle... a few fill ups, and its usually like 300+ miles remaining whenever I reset the fuel/trip-odometer. Yesterday, I filled up with 91 (maybe 92), the high grade... I wasn't quite empty, but put 27 gallons of fuel in. When I reset the fuel remaining read out, it gave me "276 miles remaining". I know the higher octane performs better... but is the computer really smart enough to know I'm burning the good stuff and will run out sooner?