I drive a 2004 Toyota Matrix. I am a nature (bird) photographer and take photographs about twice a week at the Bitter Lake NWR near Roswell NM.
The tour loop is 8 miles around and the speed limit is 20mph. But I idle around the loop at about 5-10mph looking for birds to photograph. When I see one I stop and either take the picture out the window or get out of my car to position myself better. I let the car idle while I am out snapping the picture.
I imagine I am using more gasoline than I should and would welcome any suggestions.