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.
NEXT STEP. Find out how much your project will cost. Provide a few details about your project and receive competitive quotes from local pros. The average national cost to build a garage is $23,573, with most homeowners spending between $14,621 and $32,525.When it comes to building a garage, a lot of factors come into play, which mimic other large-scale building projects.he average national cost to build a garage is $23,573, with most homeowners spending between $14,621 and $32,525.