[LostinTransit]

Here's some more results. After driving more than 700+ miles in a 4 day time frame.. our MPG's never went over 24.0 But didn't drop either.. One difference we've noticed is that while and shutters were on the van and the system closed at higher speeds.. the van struggled to reach 80 in a 75 MPH zone.. But with the shutter slats removed..(10 of 14) the van was able to reach a top speed of 110 MPH. So within the 3 years of ownership, the van has never seen 24.0 MPG nor has it ever seen 110 MPH till now.

More information and clarification:

We've been running 89oct, No performance air filter but added NGK spark plugs and have had the rear of the van lowered to less than 40mm. The issue here is that before lowering the van had a very pronounced forward rake. meaning the front of the van was approx 40mm +/- and the rear of the van was 101mm +/- now that we've lowered the rear to les than 40mm, the rear is lower than the front and the van's front end is not very aerodynamic. In fact it's nose up and I was hoping to lower the front end to balance or level the van out.

However after our trip, the tires have been scrubbing the fender wells. So this means we're not going to lower the front any more as it's nose up.. I'm thinking of adding a forward splitter to offset this nose up. So in this same breath, would these wind defuses things added to the rear of the roof offer any defusing of wind to make any difference. yet, we're not able to add these low profile shark fins to the rear of the van until we have the roof wrapped.