###### Abstract  
Connected cars have often been defined as vehicles that can provide some services and information without human intervention. Several scholars have examined the factors that promote the purchase or adoption of such augmented vehicles. However, little emphasis has been placed on the determinants for reducing car expenditures when a driver owns a car with an Internet of Things (IoT) device or a smart assistant in the context of smart mobility. Therefore, this article analyzes whether emerging technology such as IoT plays a key factor for a driver concerning the expenses related to the car (e.g., insurance, maintenance, and repairs). To this extent, a methodology based on exploratory (i) and confirmatory analysis (ii) was carried out. The authors initially conducted an exploratory phase by means of a Delphi method in which a group of vehicle experts (\(n=25\)) were recruited to give their opinions and reach an agreement defining the determinants that they believed affected vehicle expenditures the most. Secondly, and taking into consideration that the salient determinant from the Delphi method was the use of technology and the warnings and alerts it triggers, a questionnaire was delivered to 556 drivers to analyze the everyday spending on their cars. Specifically, the survey aimed to compare the responses of people who own connected cars or have any kind of built-in IoT infrastructure (\(n=302\)) with those of people with non-connected cars (\(n=254\)). The main conclusion obtained for this latter approach was that drivers with a connected car have remarkably lower car expenses than those driving a conventional car. s 202219 January 20220 January  
could help us to create more sustainable cities, saving costs and CO2 emissions for citizens and governments. A connected car is defined by [PERSON] and [PERSON] [3] as \"a vehicle capable of accessing the Internet, of communicating with smart devices as well as other cars and road infrastructures, and of collecting real-time data from multiple sources\". The vehicle, therefore, ceases to be a system that only transports us and becomes a means of transport that can help us satisfy our daily needs. A vehicle may cover our needs in real time by providing the most accurate products and services available at that time. This technology must be able to control some parameters of the car and interact with the vehicle and its driver. This underlying technology is recognized as IoT. There are diverse technologies that can be used to instrument a car, such as a vehicle communications system (Vehicle to Vehicle--V2V, Vehicle to Infrastructure--V2X, Emergency Call--E-Call), cellular GSM technologies (SIM car with 3G, 4G, 5G), different software associated with car systems (Android and IOS systems, Amazon Car, Voice Assistance) and Internet of Things devices (IoT). An IoT device, based on GSM and Global Positioning System (GPS) technologies, which also takes measurements of the car, e.g., fuel consumption and other parameters through OBDII protocol, was used in this paper to transform a conventional car into a connected car. We used an OBD-II device (On Board Diagnostic)--a standard device connected to the vehicle, that is provided with an internal SIM card that transmits mobility information (e.g., location, speed, acceleration, braking, etc. ), as well as information from the car's on-board computer (e.g., engine failure, engine temperature, maintenance needs, etc.). As an additional description and according to [PERSON] [4], \"the connected car means a continuously Internet-connected car, generating and transmitting data\". These data can prevent fatigue, provide real-time assistance in case of accidents, and assist cars in performing remote diagnostics. According to a study by PriceWaterhouseCoopers [5], 40% of total mileage will be made by autonomous vehicles in the European Union (EU) by 2030. In that same year, the pool of vehicles is also expected to fall from 280 million to 200 million. This represents a 28.5% reduction in the passenger-car pool.