Hello,
I have four plug-in electric machines that I use to do work in my yard.
Electric 20" mower
Electric leaf vacuum/blower
10" pole/chainsaw
I have heavy duty hedge/brush cutter, too -- I forget the brand and model at the moment.
The mower uses an average of 0.425kWh per hour. The BTU equivalent is 0.0127 gallons of gasoline per hour.
The leaf vacuum/blower uses 1.15 kWh per hour. The BTU equivalent is 0.034 gallons of gasoline per hour.
I used the chainsaw (to cut fallen trees and to prune dead branches) for about an hour, and it used 0.3kWh -- which is equivalent to just 0.009 gallons of gasoline. keep in mind, that you cannot use a chainsaw as continuously as the other tools. It does also require chain lubrication oil, like any chainsaw does. The pole attachment is adjustable up to 15' long, and it is an awesome tool if you have any trees to deal with.