[elhigh]

You can do some sneaky mods that people won't even notice. Add color-matched fender skirts to the rear wheels, that big slab-sided van will make them blend right in. Add a warm air intake to fool the computer into leaning out the engine. When's the last time your wife raised the hood of the car? If she's like mine, that'd be never.

You may not have much chance to seriously improve the van's fuel economy, but you can at least take steps to passively minimize the damage.