Is your car guzzling gas? To find out, jot down your mileage the next time you fill up says David Champion of Consumer Reports. When the tank is 1/4 empty, fill up again. Note the mileage and number of gallons purchased. Calculate how many miles you traveled between fill-ups by subtracting the old mileage from the new. Divide the miles traveled by the gallons added. The result is your miles per gallon.
What's the best way to improve fuel efficiency? Accelerate gently.
