03-10-2013, 12:32 PM
I know I'm being anal here but remember efficiency can be measured in a number of ways, this all boils down to how well they burn the fuel, being at 10psi would be much more 'efficient' than burning fuel at 2psi you'll just burn a lot more fuel but have a higher efficiency of power.
![[Image: 22f2b6b2-758b-4c1c-96fb-6fa9c6059b13_zpsf306b56b.jpg]](http://i585.photobucket.com/albums/ss299/Ha11elujaz0rs/22f2b6b2-758b-4c1c-96fb-6fa9c6059b13_zpsf306b56b.jpg)