The winter tires definitely are hurting you a lot. Sometimes city driving can help if you can coast and try and maintain constant speeds but yes aggressive drivers and idiots can and will ruin your mpg with their bad driving.. Get some summer tires, keep driving with with a light foot and get a Mpguino. The instrumentation will help you tremendously. As for Lucas all it will do is cost more than its worth and throw off the math for your mileage each tank. Good luck!
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