Originally Posted by Wiseguywireless

I have a Used MVT truck with them on it. The fuel cost for these trucks are much better than our older ones, but they suck in the hills. On the flat I do better than 8 mpg running under 65. but when I hit PA, NC, TN, and all the hilly states, it drops to under 7mph. closer to 6, what the wheel covers do. Well I have never taken them off to see the difference, but I am always driving different roads also so there would be no good comparison.

I heard that MVT gets rid of their trucks when they start losing fuel mileage and their is always a big demand for their used trucks when they do sale them.

Originally Posted by Cowpie1

I have them on the ride I will be getting rid of next month. I am not sure they do anything for aero. I put them on because i hated to shine aluminum and they looked good. Mine are polished stainless steel from Real Wheels.

I was just going to say that the only positive i can see is they come in stainless so you just have to wash them off and you got shinny wheels instead of polishing out all that alumnium.

I have thought about buying a set of the paintable one's and matching them to the color of my truck but don't want to waste the $$$ if it looks stupid lol

Also, just a side note, I had a level 1 inspection done in CO 2 weeks ago and the DOT officer told me to remove my front hub covers I had on there. He said they were not going to allow them anymore in CO since you cannot chack for a leaking seal on a pre-trip w/o removing them. I honestly think it was just HIM, and not the whole state, but it did make some since to me and I have just kept them off. I did however buy a set of polished hub seals for it

I'm getting roughly 7.2-7.3 with my 2006 Century with a 515 Detroit 3.70 rears here's what I've done so far ..
1. Pittsburgh power stack
2. Air Tabs
3. Fleet 1 Air filter

My next investments

1. Drive wheel covers
2. Vented flaps

If the lower last 2 get me even 1/10 I'll save close to 1,000 in fuel a year for a 400-500 total investment I can't see the hurt .. If I hit the 2/10 range I'll be smileing ear to ear ..
fleet 1 told me 2-4/10 on a Detroit with my filter # with a few reported close to 6/10 my gain was roughly in the middle at 3/10 but for a investment of 329.00 ( that included shipping ) I didn't get hurt .
Im not one to promote every little gimmick out there and try to research what I do extensively before I purchase a product but no one can be sure until you try it .

I hope I can eventually get my. Truck up to 7.5-7.6 loaded at 43-44,000 and I'll be thrilled
my current loaded numbers are posted above but here are my other numbers

Bobtail = 11.4-11.8
empty = 8.9 - 9.3

These are 53ft van numbers

Oh that's driving 59-62 mph if I go to 65 mph my fuel economy drops extensively
From : 7.1 loaded to around 6.5 even 6.4 some cases I've saw my SWEET SPOT I know that's a KR term but anyway it's around 59-60 I do see a small - marginal gain at 58 mph but from 58 to 55 no diffence in my truck at all or not recordable .