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Old 03-10-2012, 11:18 AM   #15
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I don't think there are speed limiters on gas engines.
My DP I'd run at 65-70 depending on conditions and got typically 8-9 mpg depending on wind, hills, etc.
It felt fine at 70 but I don't think I'd feel comfortable at 85.
That's funny Todd, your father switching seats figuratively and physically.
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Old 03-11-2012, 02:20 PM   #16
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100% Sure a 2002 Itasca Sun Cruiser has a 76 mph speed limiter when stock! I'm not saying all 8.1L in the Workhorse chassis had a speed limiter, but every one I ever talked to at camp grounds that actually bumped it were also surprise it was set so low. I found this out the very first trip while passing another MH!
As for the question about cold air intake. When under throttle, you will hear more engine noise from the front passengers feet area!
Early on ours had mods to the exhaust, intake, and front and rear anti sway bars added. Took a few years for the 'average' DP to be able to keep up in the hills w/the 8.1 & Allison!!
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Old 03-11-2012, 07:50 PM   #17
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My 2004 Itasca Suncruiser 33 with the 8.1 gets 7.1 over 40,000 with almost all pulling a midsized (5,000 pound) pickup as a toad. We drive around 60 and are on non limited access roads a lot. Hard to believe anything much more than that. My old coach with the 464 got about 8 mpg. You can get a whole lots less by going faster. I believe in the momentum system of driving..coast a lot, use the brakes as little as possible and look ahead to plan on maintaining your momentum.
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Old 03-11-2012, 07:52 PM   #18
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W series Workhorse chassis with the 8.1L gas engine have a "limiter" which cuts the fuel to the engine at 80MPH. It does not shut off, but the fuel is limited. The only way to go faster is to be on a decline, or have hurricane force tail winds.

OBTW, the standard Michelin XRV tires are rated "not to exceed" 75 MPH... but I have.
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Old 03-11-2012, 09:02 PM   #19
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We left San Jose, Ca yesterday with a full tank - filled up with 430 miles on the odometer and took 61 gallons (at $4.65 a gallon ) - you do the math...

That was pulling over Pacheco Pass east of Gilroy, then down I5 and up the Grapevine to Hwy 14, then east to I15 and south to I10 - we filled up near Palm Springs. Some fairly decent climbs and a lot of pretty level roadways, so the mileage is pretty representative of what you could expect if you keep the cruise control set on 57 mph!
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Old 03-12-2012, 08:52 AM   #20
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Quote:
Originally Posted by edgray View Post
W series Workhorse chassis with the 8.1L gas engine have a "limiter" which cuts the fuel to the engine at 80MPH. It does not shut off, but the fuel is limited. The only way to go faster is to be on a decline, or have hurricane force tail winds.

OBTW, the standard Michelin XRV tires are rated "not to exceed" 75 MPH... but I have.
how does the engine/chassis determine what speed its going? Cant say Ive ever felt the engine pull fuel or spark but I rarely drive it near redline or 80mph.
Pretty sure the tire rating of 75 mph is at max load just like the sidewall pressures. Weight goes down, speeds go up.
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Old 03-12-2012, 09:46 AM   #21
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My limit switch cuts me off at 65 mph. She sits in the passenger seat.
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Old 03-12-2012, 10:12 AM   #22
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Most times we'll get 7.5 mpg towing the Wrangler @ 60 - 62mph. Any faster and the credit cards start smoldering. Bob
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Old 03-15-2012, 09:25 PM   #23
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Lucky dog

I must be the lucky one. On the east coast foothills and mountains I get 6.4 to 5.9 but when we hit extended level runs I get 9.8 and one tank 11.9. (Had to check my math twice). Since then that has happened twice. I've got an 2006 8.1L -22chasis that as far as I know has not been modified. I drive 55mph, yeah that's right, I'm one of them guys you've passed and cursed a time or two (Itry to stay out of the road). It just seems my motor runs real easy at 55 so I just let it, seems to hep the fuel consumption too.
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Old 03-15-2012, 09:36 PM   #24
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I think it is pretty hard to be accurate checking just one tank. I stopped doing it and keep track of my running average for about 40,000 miles.
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Old 03-16-2012, 12:33 PM   #25
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Just got back from a 4, 000 mile trip, to Texas then back to California. I have a 37 foot Southwind 8.1 and pull a jeep liberty. Average was about 6.8 mpg, hills, wind, etc more or less, and driving 60 to 62. While in Texas it seemed that less stations had gasoline with 10% ethanol, as they do in California. With tanks of gas w/o ethanol I got better mpg.
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Old 03-16-2012, 12:45 PM   #26
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I get 7.5 - 8.5 in my 36' Dolphin.
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Old 03-16-2012, 03:24 PM   #27
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8 to 9.6 at 60mph in cruze towin the saturn.
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Old 03-16-2012, 04:45 PM   #28
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I'm with Lindsay, my speed limiter is in the right seat and kicks in at 65.

I have a 2000 Allegro 31WB with the Ford V10. I have avg. anywhere from around 6.8 to a best of 11.8 mpg. (no toad). I don't think the difference between the GM vs. the Ford is going to make a difference. As I am now shopping to upgrade my rig (see post on this site) I originally was going to look at either the 8.1 GM or diesel. Well we (DW) determined that our needs now just don't make sense to go to the expense of diesel since we are not retired etc. Looking at the power numbers of the Ford vs. the big GM motor, horsepower and more important torque, we are shopping Ford, and they too are less expensive than the Workhorse rigs.
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