Cows emit a massive amount of methane through belching, with a lesser amount through flatulence. Statistics vary regarding how much methane the average dairy cow expels. Some experts say 100 liters to 200 liters a day (or about 26 gallons to about 53 gallons), while others say it's up to 500 liters (about 132 gallons) a day.
1 According to author Stu Silverman the average cost of adding a garage begins at roughly $7,500, and for a two-car garage the average costs will go much higher.2  This sort of structure will average at $27,040. 3  The resale value of this update would hold at $21,635, or a nearly 81% return on investment.or the garage addition, the typical costs include: 1  According to author Stu Silverman the average cost of adding a garage begins at roughly $7,500, and for a two-car garage the average costs will go much higher. 2  The above figures place the garage addition at $40 per square foo t.
How To Rough Estimate Cost To Build Garage. by Jay Behm -A very basic way to estimate the cost of building a detached garage is to simply apply a typical average per square foot construction of $30 to $40. That is for an average cost basis for having a contractor / builder build a basic one story garage for you on your property. If you are in an area with higher-than-average cost of living you can use $50 to $55. If there are complications or you prefer top quality materials and components the price can go up.So, generally speaking, a 24 ft.sq., two car, basic garage will cost in the range of $17,000 to $23,000.