Oil prices are rising worldwide due to the war between Russia and Ukraine. Korea is an absolute energy importer, and the impact is very large. As the oil price rises, the sensitivity of fuel cost increases, and the importance of fuel efficiency increases. There are various driving methods to reduce fuel economy, but there are no quantitative figures. Therefore, in this study, quantitative figures were provided by analyzing the fuel efficiency and economic feasibility according to carpool driving and tire pressure change. For accurate fuel economy measurement, tire RRC(Rolling Resistance Coefficient) measurement, driving resistance measurement in real driving road, and chassis dynamometer-based fuel economy were measured. The difference in fuel efficiency by condition was up to 3.9%, and the annual fuel cost was up to 69,591 won. A benefit-cost analysis was conducted to analyze the economic feasibility of carpool operation, and the benefit-cost ratio was 9.919, showing economic feasibility.