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Tires
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Tires impact fuel efficiancy as well as traction. Unlike other upgrades, there are no levels for 
tires. Instead switching tires costs a flat $300 each time. Also note that monster truck tires negate
the bandits event and that sticky tires negate the icyroads event. 

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Name              Negations    Fuel Efficiency       Description              
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tire_econ           0.0            1.5          A fuel efficient tire, but at the cost of traction
tire_normal         0.0            1            A tire that is balanced between fuel efficiency and traction
tire_sticky         0.3            0.8          Negates damage from the icy_road event at the cost of fuel efficiency
monster_truck       0.3            0.8          Negates damage from the bandit event at the cost of fuel efficiency
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