The smell of an oily rag

exp.

Heard in Donegal

A saying used to describe a car or "Vehicle" that is easy on fuel.

In use

Dan: "Is th'on yock hard to run John?" John: "Sh'd go on the smell of an oily rag"

Posh English

Does that motorcar cost a great deal to operate, John? Oh, it is remarkably economical on petrol.