your best bet for fuel consumption savings is to go with a Coleman liquid (white gas/coleman fuel) stove. Like has been mentioned above, you can pick one up on Craigslist for ultra cheap....less than $50 for one in great shape. They come in three sizes and have been made since the 40s:
Models:
425 - this is the smallest (17" wide) two burner and burns white gas/CF only. Can get one off CL for well under $30
424 - same as the 425 but is the newer dual fuel model that'll burn white gas/CF and Unleaded gas. These go for $85 new off Amazon, but again should be able to pick one up used for well under $50
413 - this is the larger of the two burners at 24" wide and burns white gas/CF only. This width stove is better for cooking as you have a lot more room for two pots. Can get one off CL for well under $40
414 -same as the 413 but is the newer dual fuel model that'll burn white gas/CF and Unleaded gas. These go for $113 new off Amazon, but again should be able to pick one up used for well under $50
426 - this is the 3 burner big boy. burns white gas/CF only. Can pick up a nice one on CL for under $50. These are tougher to find. Great if you're cooking for a lot of people.
428 - same as the 428 but is the newer dual fuel model that'll burn white gas/CF and Unleaded gas. Can no longer get new. should be able to pick one up used for under $75. there weren't very many 428s made so they normally get a premium....I believe new they were in the $150-170 ballpark. You see some on ebay fetch close to $200.