If you have a fair size lawn that involves quite a bit of mowing then you would certainly be better off with a petrol mower (cuts better and also no wires to worry about). In terms of efficiency, most small engine petrol mowers are much of a muchness. In general, the more horsepower they have the more fuel they will use (depending on how hard you rev them and how much work they have to do), but on the flip side of this the smaller the engine and less horsepower it has, the harder you will have to rev them to do the work so the more fuel they will use, if you see what I mean.
In terms of quality and reliability - In general, the Honda mowers tend to be some of the best and most reliable.
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!