The Maruti Tour is specifically designed as a taxi vehicle, which is why the LDI variant is the only option. The LDI variant is equipped with features that make it the ideal choice for a taxi, such as a powerful engine, spacious interior, and fuel efficient performance. It also offers a high level of reliability and durability, making it an ideal choice for taxi drivers. Furthermore, the LDI variant is also the most cost-effective option, as it offers the most value for money.