[ChopStix]

@aardvarcus, Your project has basically the same aero problems as my van. One of which is that the doors round in on the bottoms which exposes the tires to straight line air. I'm working on a spat design to direct the air outward around the tires to see what that gets me.

As for a nose spoiler, my vans bumper cover is almost straight in line with the cross member. So there's no need for an additional chin spoiler. But maybe a nose pan would help a little bit over none at all.

I have skipped on the grill block idea as others have made posts about the GM HEI's overheating from not enough air flow. I don't want to be broken down for a fried distributor module.

Beyond that, I gained 1mpg from removing the roof rack, and 2mpg from changing wheels/tires. My stock aluminum wheels with winter tires are 10lbs heavier each, over a set of steel rally wheels with LRR tires and moon hub caps.

I'm presently working on installing an electric fan, and reduction pulleys to see what that gets me. I expect another 3mpg from these. Plus I need to clean out my van as its got a bunch of junk in it right now.... The mods are easier than cleaning it out!