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I would guess that averaging the price out is going to cause the big error.
Try something like below to track you MPG based on usage.
Or simply fill to brim, drive. Fill to brim again and work out MPG on that tank. Rinse & repeat as often as you like.
Try something like below to track you MPG based on usage.
Fuelly - Track and Compare your MPG
Fuelly allows you to tracks your gas mileage over time, helping you calculate fuel expenses as you drive.
www.fuelly.com
Or simply fill to brim, drive. Fill to brim again and work out MPG on that tank. Rinse & repeat as often as you like.
