WR is not a huge car and is perhaps the most fuel efficient out of the local PKDM options. Logic dictates that economy class will be the most used class for these services.
It would be more costly in terms of upfront and recurring costs, to roam around with a single passenger in something like Corolla or Civic.
Don't cancellation charges apply? And isn't the passenger told what car model is the driver/captain using when booking the ride?