e·con·o·mize 
(ĭ-kŏnə-mīz′)
(ĭ-kŏnə-mīz′)v. e·con·o·mized, e·con·o·miz·ing, e·con·o·miz·es
v.intr.
1. To practice economy, as by avoiding waste or reducing expenditures.
2. To make economical use of something: "The best that can be said for this method is that it economizes on thought" (Christopher Hitchens).
v.tr.
To use or manage with thrift: the need to economize scarce energy resources.
e·cono·miz′er n.