# 49. Manipulation of bias and heuristics in decision making ## 49.5. Methodology/Refinements/Sub-species ### 49.5.69. Time-saving bias This bias is concerned with underestimations of the time that could be saved when increasing from a relatively low speed, and overestimations of the time that could be saved when increasing from a relatively high speed. "Speed" can be seen as a synonym for pace or performance of work, progress, investment, development, etc. A manipulator can use this bias to alter a victim's perception of the benefits of accelerating or decelerating, by making appropriate comparisons of possible changes in "speed". For example, a driver in a hurry may accelerate from 100km/h to 110km/h to save time. But in fact this only saves 10% or less of the journey time. A driver accelerating from 30km/h to 60km/h will save 50% of their journey time. We tend to ignore the relativity of the benefit we gain (or lose).