I'm waiting for one SS, GT or Challenger SRT8 owner to swap out their V8 for a 4 Cylinder. Plug and play. The 2013 hybrid civic has a nice gas and electric 4 cylinder engine that gets around 40 mpg.
Take out your LS3 or Coyote engine and drop that Honda in! If you have a 392 Hemi-- think of the gas savings and the wonderful high revving buzz of your new engine as you creep off the line, passing your neighbors toddler on his Big Wheel!: