I am getting ready to purchase a Xcal 3 for my 2002 Explorer 4.0 and was wondering how everyone likes theres? I would like a mileage, towing and performance tune. Will i see noticeable gains in these 3 areas with the Xcal 3? Should i make towing and performance tune on 93 octane and mileage 87? What would happen if i had 87 octane in gas tank and switched to 93 performance? Does everything come with the Xcal 3 that i need to tune my truck? Thanks