36 nüvi 2405/2505 Series Owner’s Manual3 Select Yes.Calibrating the Fuel EconomyYou can calibrate the fuel economy to receivemore-accurate fuel reports for your specificvehicle and driving habits. You should calibratewhen you fill up your fuel tank.1 Select Apps > ecoRoute™ > At the Pump.2 Enter the current fuel price.3 Enter the amount of fuel the vehicle hasused since the last time the fuel tank wasfilled.4 Enter the distance you have travelled sincethe last time the fuel tank was filled.5 Select Next.The device calculates the average vehiclefuel economy.6 Select Save.About the ecoChallengeecoChallenge helps you maximize the vehiclefuel economy by scoring your driving habits. Thehigher your ecoChallenge scores, the more fuelyou have saved. The ecoChallenge collects dataand calculates a score whenever your device ismoving and in Automobile mode.Viewing ecoChallenge Scores• View your current score in theecoChallenge icon on the map.• Select to view detailed scores.About the ecoChallenge Score• Current—displays the score for your currentdriving activity.• Overall—displays an average of the speed,acceleration, and braking score.• Speed—displays your score for driving yourvehicle at the optimal speed for conservingfuel (45–60 mph for most vehicles).