Both 87 tunes will give you an improvement. I have found that the tow tunes make better daily drivers but the performance tunes are more fun. Mileage depends greatly on your driving style. The tow tune makes it easier to obtain better mileage because it is designed to effectively operate with loads. That helps to get these big bricks on wheels moving and maintaining speed easier and more efficiently. The performance tunes allow the vehicle to be more agile in traffic. They make it easier to jump from slow lanes to faster lanes with better acceleration.
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