Astronomers like to travel out of the cities to places with dark skies and fuel is getting expensive. The attached file lists some of our most economical cars. Some of them are too small for a decent sized telescope and the hybrids can't tow anything but the 1.6L and 1.9L diesels can carry a fair bit and tow too. Unfortunately diesel is about 10% dearer than ULP but diesels make up for it with 30% better economy.
Reference:
http://www.greenvehicleguide.gov.au/...4-0a87fcc08dda