Bubbles, my Mazda3, has a gas mileage computer built in that calculates instantaneous and average gas mileage. I decided to actually look at it today, after I just reset the numbers. I just filled up and started going home on the highway. Here are two interesting observations:
-My average gas miles per gallon was 38.8 mpg, going 67 mph, for 30 miles. 38.8 mpg sounds really good!! =)
-Using air conditioning reduces mileage by 6 mpg, while going 67 mph. Hopefully, my tinted windows keeps me from using a/c too often...