gas guzzler 
noun informal
A large car with a high fuel consumption: they should now be driving small cars rather than clunky Detroit gas guzzlers...
- This is still the land of the gas guzzler and we were at cross purposes.
- SUVs are big-time gas guzzlers, adding substantially to the problem of global warming, and it's killing our coral.
- Drivers of gas guzzlers such as SUVs should stash away even more funds.