Bonuses

Low Energy Consumption:

 * level 1 : -5% energy consumption
 * level 2 : -10% energy consumption
 * level 3 : -15% energy consumption

Powerful:

 * level 1 : +2.5% performance
 * level 2 : +5% performance
 * level 3 : +10% performance

Economical:

 * level 1 : -4% price
 * level 2 : -8% price
 * level 3 : -12% price

Silent

 * level 1 : +2% attractiveness
 * level 2 : +4% attractiveness
 * level 3 : +6% attractiveness