I shy away from using the alcohol stove for backpacking: alcohol fuel is pretty inefficient by weight and it seems more likely to find canisters than Heet along the AT.
Yeah, the break even point to when alcohol is lighter than other fuel setups varies with the stove choice, amount of cooking, and number of days of fuel carried, but for sure at some point alcohol fuel gets heavier when it is longer between resupply. For me that means alcohol is almost always lighter for bike touring, but something else might or might not be lighter for backpacking depending on the trip.
Someone mentioned the fire risk of alcohol. My Trangia seems pretty safe, but my alcohol penny stove blew apart a few times. In waning dusk, those luminous blue pools of burning alcohol are really pretty, even when they're on you.
I have always been a little puzzled by the comments about that. I have seen pressurized stoves flare up now and then over the years, but alcohol stoves have never burned out of control for me. Even if a little alcohol would spill and burn it isn't a very aggressive fire and with any reasonable care it would be on a cleared surface. The fireball that a pressurized stove can create on the other hand can be terrifying.
Having caught the stove bug (I have to own ALL the stoves) I recently picked up a MSR Whisperlite. If there's any fuel you can find on the road it's gasoline. I plan to carry gas in the third bottle holder on my LHT to keep odors out of my bags. I cut out a piece of a cookie sheet to put under pots that seems to correct the MSR's inability to simmer.
Yeah me too on the stove bug. I have way too many. I found that the WhisperLite International simmered okay for me.
I'd like to burn coleman fuel, but carrying even a quart seems excessive for a bike tour to me and that is the smallest quantity I have seen for sale. I am pretty sure the the stuff sold for zippo lighters is pretty much the same thing. Ronson and Zippo sell it in 4, 5, 8, or 12 ounce sizes. The containers look like they might be a reasonable container to carry it in if bagged in a ziplock bag. It is expensive at as much as a buck an ounce though. The 4 or 5 ounce sounds small but given that it has something like twice as many btu's per weight it isn't as bad as it sounds.
I just checked to see how available Zippo or Ronson fluid is and Walmart and walgreens both seem to have the Ronson 8 ounce bottles in stock within 2 miles of my house so probably pretty available. It is $1.97 for 8 ounces at walmart here. That sounds like not too bad of a way to go. Gasoline is a reasonable fallback in a pinch, so there would always be something to burn in the Whisperlite.
I have read claims that charcoal lighter fluid was similar, but I have my doubts. I think it is closer to kerosene.