Vehicle Table
Vehicle Table
... hopefully you got a 2WD with the 5MT.
Looks like you've already got it primered, so the next green step is to paint it white. At least paint the roof and doors white to reject heat and reduce the need for AC or windows down.
Definitely add some instrumentation, work on your technique, and add a kill switch. It shouldn't be too hard to get in the high 30's, mpg wise.