Jetstar is currently running its 30 cent fuel discount offer, which provides a one-time voucher offering 30 cents a litre off if you book a flight before August 28. While this might represent a useful bonus if you booked a flight you were planning to take anyway, there's a danger that people will buy tickets they didn't otherwise plan to get, thus eliminating any real savings. A similar logic applies to the extra 2 cents off you can get in many servos if you purchase $2 of goods -- if that's not stuff you needed to buy, I figure the saving is illusory. But what do Lifehacker readers think? Are fuel cost saving initiatives worth pursuing, or are you better off trying to cut the amount of car travel you undertake? Share your thoughts in the comments.