Zippo can get spendy if you're an engine junkie and run them frequently. The Zippo can's squirt nozzle is convenient, but you still need to add oil to it for the piston ring, so there is limited joy with that feature.
Zippo lighter fluid, Coleman camp stove fuel, painter's naphtha, and 'white gas' are all naphtha products. Coleman markets it in gallon cans for around $20 (or less at some stores) which is a better buy than 4oz of Zippo for around $6. A can of Coleman will feed your engine/s for quite a while, and you'll still have some left for your Whisperlite if you enjoy being bear bait.