What that means is that unless you're driving a car that has an engine in the 1 liter range, it's actually cheaper to run a space heater for an hour than it is to idle for ten minutes.
Ihe nke a pụtara bụ na ọ gwụla ma ị na-anya ụgbọ ala nke nwere engine na 1 liter, ọ bụ n'ezie dị ọnụ ala karịa iji gbanye ọkụ ọkụ maka awa karịa ka ọ na-abaghị uru maka minit iri.