Not much work done in the past two years, a newborn kid and building a house from the ground up took away my free time...
But now I have time to attempt a bit of rear aero cleanup...
This is after a 12 mile drive on a muddy road, with speeds under 30mph:
Jeep made a spoiler to help keep the rear hatch clean and people report it's helping:
Am I right thinking that if the hatch is cleaner, the rear wake is reduced, also reducing drag?
The price tag is around $150, so with 0.2L/100km gain (~2% improvement) it would pay for itself in 2-3 years at the current fuel price.