This is an interesting question: I hoped to find the data in chart form, but without success - it must be a secret. The formula using the modal freezing point coefficient (Delta T = 1.86 x modality) seemed to give very high concentration levels.....I didn't trust the answer.
However, maple syrup is said to get very thick but does not freeze at 0 degrees F. Maple syrup is mainly sucrose at a typical concentration of 66% sugar. I decided to test table sugar.
White table sugar is also sucrose. I took equal amounts (100 grams) by weight of table sugar and added it to water. After heating the solution and stirring all the sugar went into solution. Last night I place the mixture in the freezer along with a thermometer. This evening I checked the sugar mixture - it was slushy pudding, but not frozen solid. The thermometer read 10.9 degrees F. Yes, my freezer runs a little warm.
From the above test it would appear a 50% sugar concentration would take you to 11 degrees F, assuming one is okay with slush in the tire. Sugar may be an option for moderate climates and/or if freezing protection is required but, the tractor is not worked in cold temperatures. In bulk, I found sugar priced around $0.50 per pound. There might be "not for human consumption" sugar at a lower cost - I did not check.
I would recommend one do their own testing before trying this.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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