### Related Research  
Even though traffic restrictions and environmentally friendly means of transportation are a reality, their effects on reducing greenhouse effect gasses have been found to not be as significant as expected [11]. In that sense, it has been observed that individuals' DS plays a more important role in emitting polluting agents than the ecological rating of the vehicle itself, with studies showing that, in different situations, aggressive driving could increase energy consumption by 47% [24]. With these assertions in mind, it seems reasonable that if we could assess the fuel-consumption efficiency of individuals, their DS could be corrected in order to increase their ecological friendliness. As found in several studies, the manner motorists operate the throttle and brake pedals, their desired rate of acceleration, speed control, and control stability play a major role in fuel consumption, regardless of the driven vehicle. Thus, we can learn how some drivers have a higher energy cost than others by studying the impact of their driving behavior on fuel consumption, thus helping high-energy-cost drivers to achieve energy-efficient DS. Factors, such as personality, ability and skills, attitudes, perceptions, socio-economic characteristics, age, gender, and experience, among others, have been identified to be related to riskier and more aggressive driving events, such as extreme accelerations, excess revolutions per minute (RPM), extreme braking, and hard starts, events that cause high fuel consumption [25]. It should be pointed out that eco-driving is mainly an operational decision that allows drivers to maximize fuel efficiency and reduce pollutants' emissions. It is characterized by the use of several techniques that help to maximize the vehicle's energy efficiency. Therefore, this concept can be seen as a set of rules that differ from the driving that motorists are used to performing, including calm driving, the avoidance of unnecessary stops, and the anticipation and elimination of idling when possible. Several authors remark that eco-driving could effectively contribute to reducing overall fuel consumption and CO2 emissions if adequate education about strategic, tactical, and operational decisions were provided to drivers [26; 27; 28]. In this sense, during the trip, and when the trip has finished, providing practical recommendations might be useful. In the most commonly used form of eco-driving measures, drivers are given advice in training sessions, and the organizers measure differences in fuel consumption and CO2 emissions before and after training [29]. Another valid approach is providing a report of the strengths and weaknesses after each eco-driving session [30]. Nevertheless, a natural evolution on those lessons provides instantaneous feedback of the driver's operational decisions [30]. It has been found that on-trip eco-drive support is more efficient, with reductions of up to 10% on fuel consumption when compared to post-drive assessment (which only achieves a 5% reduction) [27]. However, the former is more expensive and it requires complex algorithms as well as real-time technology dependence, while the latter can be provided through an end-of-trip fuel consumption assessment [27]. Thus, the impact of eco-drive education has been consistently verified in the reference publications, from particular drivers to transportation professionals. For that reason, several attempts of fuel economy-intended system implementations, acting on the aforementioned parameters, such as gear recommendation [31] or eco-driving scoring, have been deployed in cars [32]. These systems, despite achieving the objective of reducing the polluting agents' emissions, with rates of 1.63% and 3.63%, respectively, have not been proven to be effective enough [31]. Consequently, and given that a personalized assessment of ecological behavior might help motorists to achieve outstanding fuel consumption results, with reductions up to 18.4% [33], providing online DS recommendations seems reasonable.