Since I can't get denatured alcohol aside from buying bottles of overpriced HEET for straight methanol (and a gallon of methanol is $26.00 shipped...) in the ban happy busybody People's Republic of Callifornia these are just some personal experiments using a Trangia burner. 70% is commonly available and so are HEET bottles so this is mostly an experimentation log for anyone else who hopefully finds this useful. Burner: Trangia burner in a Trangia 25-3 HA windshield set Pot: 1.5L HA pot Environment: Conducted indoors with forced ventilation (fan pointed out window) for odor management 70% isopropyl : HEET (actual amount used) 4:1 (20ml/5ml) Sooting: Mildly, significant amount cleans off with a melamine sponge ("Magic Eraser") Stink: Yes, stinky odor once hot. Warmup/Blooming: Slow to start When hot: Burns intensely, yellow to orange flame tip without pot, blue from jets Cost: 1/1.77 or 57% of HEET Notes: It gets stuff hot but stinks and soots but less so than burning straight 70% isopropyl. Image attached shows sooting. Odor does not seem to affect food (ramen) in the testing environment. Pot is a little wet as it was rinsed. 3:1 (12ml/4ml) Sooting: Small spot of soot in the center, cleans off with a melamine sponge Stink: Yes, stinky odor once hot. Warmup/Blooming: Slow to start, difficult to keep alight (perhaps lower level of alcohol?) but putting the pot over the burner helps. Needs pot kept over it to help warm burner up or it goes out. When hot: Burns moderately with blue flames but with yellow core encased by blue flames in the center without pot. Cost: 1/1.70 or 59% of HEET Notes: It gets stuff hot but stinks but soots less than 4:1. Image attached shows how mild it is. Everything from this test out did not have actual food and was used to just warm water. 2:1 (10ml/5ml) Sooting: None noticible Stink: Yes, stinky odor once hot but slightly less obnoxious. Warmup/Blooming: Like 3:1 When hot: Burns moderately with mostly blue flames with a little bit of reddish-orange at tips without pot. Cost: 1/1.57 or 64% of HEET Notes: I think this is a good compromise if used in a well ventilated environment/outdoors. It is cheap and you can substitute a significant amount of methanol out for cheap isopropyl. Image attached shows the lack of sooting: 1.5:1 (9ml/6ml) Sooting: None Stink: Yes, significantly less stinky but still present Warmup/Blooming: Warms quickly if a little 70% iso is put around the rim of the burner to give it a little assistance/boost When hot: Burns moderately with very blue flames with a little bit of red/orange streaks without the pot. Cost: 1/1.50 or 66.7% of HEET Notes: Beyond the mild isopropyl combustion stink this is a good compromise mix as the cost unit is 1/1.5 of HEET. 1:1 (8ml/8ml) Sooting: None Stink: No isopropyl stink, lightly "sweet" methanol burning smell present. Warmup/Blooming: Rapidly comes to a bloom with blue flames When hot: Burns moderately with blue flames with slightest bit of red to orange without thepot. Cost: 1/1.38 or 73% of HEET Notes: Most expensive but less expensive than straight HEET. Closest to burning methanol. Perhaps if I have time I will try some 91% mixed with methanol or salt out some 70% to bring it up concentration wise but that's a future project and this came out of curiosity after finally getting a Trangia. In regards to the stink it smells like burning isopropyl alcohol, I suspect it is likely the bitterant in it not being fully combusted. The smell doesn't seem present if used in a pressurized stove. The isopropyl alcohol I am using is standard rubbing alcohol so it is likely nothing nasty that is burning beyond the denatonium benzoate in it. Methanol combustion is mostly complete beyond the potential for formic acid and formaldehyde but that is mostly from a study regarding methanol in gasoline for car engines. The entire point of this was to reduce the cost of alcohol, with reference prices as: 70% isopropyl 32oz ~ $1.79-1.99 HEET 12oz ~ $1.49-1.58 Shipped 1 gal (128oz) methanol as "race fuel" ~ $26.00 Or: $0.0563/oz isopropyl $0.1242/oz HEET $0.2031/oz gallon methanol "race fuel" So at respective ratios assuming equalized: 4:1 .2252+.1242 (5) = $0.070/oz or 1/1.77 HEET 3:1 .1689+.1242 (4) = $0.073/oz or 1/1.70 HEET 2:1 .1126+.1242 (3) = $0.079/oz or 1/1.57 HEET 1.5:1 .0844+.1242 (2.5) = $0.083/oz or 1/1.50 HEET 1:1 .0563+.1242 (2) = $0.090/oz or 1/1.38 HEET Reference: 1 gal denatured alcohol procured outside of California ~ $15.49 Or: $0.1210/oz (still more expensive than isopropyl mixes) Note that isopropyl prices may have gone up to $2.00-2.18 for 32oz and knocked down some of the savings available. At $2.18 it would be $0.6812/oz but still below HEET cost wise. Furthermore 70% isopropyl has less energy content in it. I'd guestimate it out as around 9,000btu/lbs, down from 12,900btu/lbs for what is likely anhydrous isopropyl. Methanol is around 8,400btu so there isn't that big of a loss from mixing isopropyl. I hope this was useful information for any experimental types, or perhaps someone with too much isopropyl or isopropyl based hand sanitizer they're salting out to make into fuel. I probably should go test some hand sanitizer or gelled alcohol in the gel burner at some point as well.