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Fubeca · 03-06-2010, 10:42 PM

So - I finally got a little more time to run some numbers.

I did several bi-directional runs between freeway exits at 70 mph. A with the topper, B without, and A again with. Ambient temp at 45F and small perpendicular crosswind (less than 5 mph)

I don't have my book with the numbers and I can't remember the details - but it did manage a 7% improvement over the open bed (tailgate up) at 70mph.

Again the test wasn't great - there was moderate traffic and I had to throw out a couple of runs due to proximity of other vehicles.

I may run the test again in later in the year when I can do it at night or early in the morning when traffic is minimal.

I'm satisfied so far!

03-06-2010, 10:42 PM	#137 (permalink)
Fubeca EcoModding Lurker Join Date: Oct 2009 Location: DFW Posts: 87 The Truck - '06 Chevrolet Silverado Ext Cab 4x4 90 day: 18.5 mpg (US) Thanks: 4 Thanked 33 Times in 15 Posts	So - I finally got a little more time to run some numbers. I did several bi-directional runs between freeway exits at 70 mph. A with the topper, B without, and A again with. Ambient temp at 45F and small perpendicular crosswind (less than 5 mph) I don't have my book with the numbers and I can't remember the details - but it did manage a 7% improvement over the open bed (tailgate up) at 70mph. Again the test wasn't great - there was moderate traffic and I had to throw out a couple of runs due to proximity of other vehicles. I may run the test again in later in the year when I can do it at night or early in the morning when traffic is minimal. I'm satisfied so far!