You need to be more specific with your question. There are too many variables that can affect fuel consumption, such as: Clogged fuel filter, dirty air filter, old/dirty sparkplugs, weak coil, etc.
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If you cut a rectangle in half you wouldn't get a solid figure at all, since a rectangle is a plane figure. If you made a straight line cut you would get either a triangle or a quadrilateral of some variety depending on exactly how the cut was made.
A cross section imagines what something would look like if you cut it in half (or more or less in half) and looked at the surface that was exposed by the cut.
Another cylinder
A rectangular prism or a cuboid.