I recently rented some Hyundai car for a trip to Seattle. Driving reasonably, that car got 54Mpg average on that trip. My old Honda 2001 gets between 35 and 4

I recently rented some Hyundai car for a trip to Seattle. Driving reasonably, that car got 54Mpg average on that trip. My old Honda 2001 gets between 35 and 40Mpg consistently.