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Old 09-09-2009, 10:09 PM   #51
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Re: Aerodynamics / MPG increase - up 16%

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I expect one of the first things I would do is strip off any extra projections, such as the stop sign, 'eyelids' over the 8-way lights, front convex mirror, etc.
I would think long and hard about it before doing that. I use my convex mirrors more than my regular rearviews.
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Old 09-09-2009, 10:46 PM   #52
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Re: Aerodynamics / MPG increase - up 16%

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Originally Posted by Redbear
By the way, I can jump the interstate mileage on the old company SUV from 13 or 14 to 16 mpg by drafting semis at 65 instead of doing 74 in the left lane. That's a 15-20% improvement.
I suspect said semi drivers don't appreciate that, as that increased drag decreases their mileage.

When I bought my bus, my father followed me home with him driving my little toyota corolla. He drafted me the whole way, and the mileage on the car jumped from 35mpg to 48mpg on that trip. Yes, drafting really does make a difference. I have to wonder though if the 8.75mpg in the bus would've been closer to 10mpg if he hadn't been in that spot.

Unfortunately, the huge "ear" mirrors on my bus stick out quite a bit, and provide way too much important visibility for me to consider sacrificing them.

jim
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Old 09-10-2009, 06:00 PM   #53
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Re: Aerodynamics / MPG increase - up 16%

Huh? What's going on? What happened to my post from last night?

Someone (other than me) replied with part of my post quoted, and their response to me was attributed as being from me. Baadpuppy also quoted from the missing post before it disappeared (or was morphed into the response).

I won't repost about adding a second bumper, or aerodynamics, but I WILL clarify what I meant about removing the front convex mirror. I meant the one out on the fender standing up on octopus arms aimed to look down at the front bumper, not the ones mounted next to the flat mirrors on the right and left sides that let you see traffic.

I currently use 6 mirrors on the company truck, and have used 8 in the past, so I'm not about to remove important ones.
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Old 09-10-2009, 07:51 PM   #54
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Re: Aerodynamics / MPG increase - up 16%

In my opinion that one IS an important one, but to each their own. I have them on both sides with one set up to look across the front and the other is set to look down the side of the bus. The big rearview on the side gets the long distance stuff, but the convex one keeps the Camrys from disappearing into the blind spot.
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Old 09-10-2009, 08:42 PM   #55
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Re: Aerodynamics / MPG increase - up 16%

My sixth mirror (or eighth, when I had both convex and wedges stuck to the outside mirrors) serves as an "anti-Camry" blind spot mirror. When I used a van, I mounted a second rear view mirror inside above the standard one in the center. This mirror aimed down and sideways out through the window in the sliding side cargo door. In the SUV, I simply leave the passenger's sun visor down, and have removed its cover and defeated the vanity light. This visor/mirror aims down out the passenger's door window instead.
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Old 01-31-2011, 10:24 PM   #56
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Re: Aerodynamics / MPG increase - up 16%

I'd like to keep this post alive, on the aerodynamics side. I think that an air dam of some sort in front would definitely be of value, and I'm going to build something to give it a try.I like the double bumper idea, or even maybe triple. If I could afford it, I'd try to put a Texas bumper on it.https://www.texaschromeshop.com/webs...log2/40992.jpg
I also think that some sort of side skirting will help and to start I'm going to get everything at least as low as the belly boxes. Wheel base length is somewhat of a problem for ground clearance. Noticed the semi trailers lately? They are all sporting some sort of skirt. (Mainly because California said they have to) but it is because of fuel mileage. Do the math, if you gain 1/4 mpg with fuel at $3.00 a gallon and you drive 120,000 miles a year. It's quite a chunk of change. I know that none of us is going to drive our skoolies even half of that a year, but every little bit helps.

I do know that this helps, because I have them on my tractor. Not the trailer because I pull a flatbed. http://www.airtab.com/main.html
Not aerodynamic but this also works http://www.airtab.com/main.html

You may want to change your driving habits. In my truck I found that every 5 mph over 55 decreased my mileage by .5 mpg. Increase your tire pressure to the maximum recommended it may ride a little harder, but it saves on both fuel and tires. Pay attention to what is way far ahead, you can see over the top of those suckers so do it. Try to avoid using your brakes, If a light changes ahead, start slowing down now by getting off of the fuel, try to judge just how fast you need to be going to just get there without stopping. It takes a LO-O-O-OT less fuel to accelerate 20 to 55 than 0 to 55.
Just my 2 cents worth, but what do I know, I've only driven a million+ miles. By the way THIS truck only has 1.4 million miles on it.
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Old 07-17-2011, 10:09 AM   #57
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Re: Aerodynamics / MPG increase - up 16%

RE: Drafting...

I would love to take a shotgun and shoot those idiots who draft behind me in the Class C. I can't see them unless I catch a glimpse of their car antennas. It's dangerous. What happens if they stop "quickly". Drafting puts you too close to see what is going on up ahead of the vehicle you are following. If I ever pull into a place and have some idiot who had been drafting me pull in to, I will definitely tell them a thing or two. Coming out west (the only long trip we have made with the bus) we had several morons squeeze between the bus (David driving in the lead pulling my Jeep) and the Class C (one almost took my front bumper off... I couldn't see their taillights!) and between the Class C and my Daughter who was following and pulling the food cart. It was worse around the bigger cities. If one of us had slung a tire, some moron drafting us would have gotten all the debris. Up side to traveling so slow was that most of the idiots didn't want to travel as slow as we were, so they didn't draft for long.

Like the sign in the back window of the bus says..."If you can't see my mirrors, then I can't see you".
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Old 07-17-2011, 06:04 PM   #58
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Re: Aerodynamics / MPG increase - up 16%

Not only that it pulls down your fuel mileage. Happens all the time in the semi, sometimes turning on your four ways will back them off at least for a bit. Slowing down sometimes will work, but much of the time they just slow down too. I think that most of the time, they aren't really tailgating for the pull, they just have their head up their ---- and have no idea of anything outside of that sphere that is only 6 inches bigger than they are.
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Old 09-02-2011, 04:51 PM   #59
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Re: Aerodynamics / MPG increase - up 16%

When this thread was originally started five years ago, i didn't think much about mpg mods on a skoolie.

Since then i've owned a couple of VW diesel cars and become kind of a mpg dork. I consistently average more than 50 mpg per tank in my 1999 Jetta. My personal best was 55 mpg, which worked out to over 830 miles between fuel stops (with 1.5 gallons left in the fuel tank)

I think there can be great value in improving the mpg of a bus. Obviously driving style and speed is a big factor, as well as not letting the bus idle excessively. (it is important to let a turbo cool down, especially when getting off at a rest stop)

Besides a double bumper/bumper skirt, and possibly cleaning up the under-body of the bus, other mods i would like to try:

purchasing a bus with good highway gears (4.10 or better)
Replacing all fluids with synthetic
Replacing mirrors with video camera's
Possible lower side skirts
Emphasis on lightweight construction
Limited Roof obstructions
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Old 04-27-2012, 09:47 AM   #60
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Re:

Quote:
Originally Posted by hoser
Dunno about you guys but 99.999% of my driving is on the interstate, want to improve your aerodynamics follow a semi or another big rig close let them cut the wind, best of all is its free.
MYTHBUSTERS spent some time doing just that, drafting behind a big rig to see what kind of mileage improvements they could get. By the time they got to RIGHT BEHIND the trailer by some 5 or so feet, the increase in mileage was on the order of over 40%....perhaps even higher.
Indeed, they did a series of tests, following at several different distances, and reporting the mileage increases as they got closer.
Now, I do not recommend getting THAT close, but I remember my dad driving the '69 LTD Country Squire wagon with the travel trailer behind it on trips, and getting substantial mileage.....we were about 75 or so feet back.

DO NOT NASCAR DRAFT A SEMI.

'nuff said.
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