the Saturn SW1 has an EPA of 37mpg hwy
I dont expect to get 40 mpg straight away, but after doing a few aero mods to it. I think stock I can get probably 34/28, as I used hypermiling techniques often, but my plan would be roughly the same for the protege5 that I was planning for the 'tera
lowering it some
partial grill block and basically cleaning up the front some for smoother transition
belly pan with rear diffuser
roof rack removal (if it has one)
partial kambak
replace all fluids/greases with synthetic ones