Fuel economy (again)

[Len Silva]

I know, I know, If you have to ask, you can't afford it!
None the less, fuel economy is an issue for me.
I have done a seat of the pants study of various coaches, gathering info from several sources over the years.

The overall mileage champ seems to be the 6-71 Crowns at 11-12 MPG. Unfortunately, they are very rare on the right coast.
Next the 4104/4106 at 10-11
I don't know if the MCI 5-X comes in at the same economy as the GM 41's.

In the 40 footers, I would guess that the two axle GM's are tops.

Next is the Eagle which some folks claim 10 MPG

Then the tag axle MCI's and Prevost at 6-7.

A friend who worked as an engineer at Eagle, told me that they actually did wind tunnel tests in the early 70's.  He said that the Eagles have a very slight taper in the last 10 feet or so and that was the result of their studies and accounts for the high mileage.

I'm looking for any info to add to my data and to collect info on mileage from you guys.

Make, model, engine/trans, driving habits etc.

When fuel was a buck a gallon, it wasn't that big a deal.  At three bucks, difference between best and worst on a 3000 mile trip could approch $7-800.00, not an insignificant amount to me.

Len

[belfert]

Choosing a bus for fuel economy is best done when the shell is purchased.  Unless you travel extensively, you likely will never recover the cost of changing shells strictly for MPG.  It would take a lot of trips saving $700 to buy another shell unless you get one realy cheap and don't spend much converting it.

I did purchase my shell for economy, but I may have been better off spending half as much on an older MCI.  I'd probably be $10,000 ahead which would buy a lot of fuel at 5 or 6 MPG instead of 8 or 9 MPG I get now.

People keep buying new efficient vehicles specifically to save on gas, but they are often spending more on the new vehicle than gas for the old car.  It certainly makes sense to get a fuel efficient car if you planned to replace your vehicle anyhow.

[prevost82]

I doubt that anyone is getting 10 MPG with 2 stroke Detroit in a 40 ft shell without a 5 tail wind. When I was in Mexico last year I headed back to the border with a 35 ft MCI 5 with a new 6V92TA DDEC/ B500 tranny and I'm running a 8V92TA Mech. / 6 speed standard, we were running around 55 to 60 MPH on flat ground and at the end of each day we would fill up. We were shocked when I was only burning 15 to 20 bucks more on a 400 mile day.

I think speed and terrain make the biggest difference, not the shell. And the guys with the small engines getting 10 to 11 would think they were standing still on some of the long grades there on the west coast ... that's where I burn the most fuel ... but I also not going up that grade for a day and a half. :-)
Ron

[lostagain]

1957 Courier 96, 35 foot, 23000 lbs, 4-71 DD, 5 speed Spicer, my foot to the floor the whole time, 60 mph max, 15 Cdn mpg ( 13 US).
This year is turboed, noticebly more power  , right foot still to the floor, but haven't done a long trip yet to see about milage... I'll let you know for better or worse. 

[prevost82]

JC ... I'm just a couple of hills away from you in Merritt. It's no wonder your right foot is nailed to the floor, with a 4-71 in the Rockys ^^^

[Stan]

Until Grayline bought Brewster's. all the sight seeing buses in Banff and Jasper National Parks were Couriers with a 4-71. On the grade going North from the Icefields, I moved over to let a new Brewster MC-9 go by and he got beside me but couldn't pass my 4-71 (free breathing with N-70s).

[NJT 5573]

Mikes 102 C3 in this months magazine sure looks good to me. Series 50, 1991, $26,000, WOW

[lostagain]

My Courier 96 is an old Brewster bus (no 9), that I used to drive in the seventies. We had 6 or 8 of them then. They got sold in '77. I love mine mostly because of the nostalgia factor . It is a great classic bus if you remember them. Just an ugly old thing if you don't

[TomC]

NJT- IMHO- that 102C3 with the Series 50 is THEE perfect setup for a conversion.  Most likely 10mpg with the same power as a 6V-92TA.  I almost wish I was starting on a new bus-I would have bought it by now.  I think you'll see the recent 40ft'rs coming up for sale for relatively cheap since everyone in the commercial bus business wants 45ft'rs.  Good Luck, TomC

[buswarrior]

Hello

Trouble with fuel mileage calculations is the validity of the data.

How full was the tank before?

How accurate is the odometer?

How accurate is the fuel pump?

How much drive to how much idle?

Generator, Aquahot, Webasto, Espar, etc consumption?

The odometer is a little devil for the math, if it is reading wrong.

Appearances in my MC8 are: 6 USmpg, 8V71/HT740 70 mph interstate blast Toronto-Arcadia return

happy coaching!
buswarrior

[scottwms]

My 4103 conversion got 11 cruising down hwy 99 from Ripon Flying J to Bakersfield Flying J. I have the 6-71 and spicer.

[bobofthenorth]

BW hit it on the head.  Single fill MPG is meaningless.  Unless you keep multiple tank records (ie. EVERY tank you buy gets recorded) then you really don't know your MPG.  Having kept record of every drop of fuel burned over the last 3 years I can say with confidence that I get:
- 6.3 MPG (Canuck gallon) at 110 km towing/Aquahot combined
- 8.5 MPG if I slow to 80 km

8-92 with 10 spd Roadranger, geared for 1700 RPM at 110 km.

[norcal_kyle]

my Eagle 10 w/ 24.5" wheels and a 350hp 6v92TA/740 gets 8-9mpg on the highway, and around 6, sometimes 7mpg in the city and on hills. the best i have ever seen on my rig was averaging at exactly 10mpg on a trip from sacramento, ca to seattle, wa a few months ago. the stretch of road was from sacramento up I-5 north till just past shasta, right before you hit the mountains. its not 12mpg(i wish, haha) but i think its pretty good for a machine that weighs almost 20 tons. lol.

[JackConrad]

When we first started converting our MC-8, (empty shell with sleeping bags and a Coleman stove) we were getting 7-7.5 MPG. After the conversion was finished, we are getting 6-6.5. This trip we are trying something different. Since we are on no time schedule, we are traveling on non interstate highways at 55-60 MPH, instead of 70-75 on the interstates. We have not had to fill up yet, so I do not how much difference, if any, this will make. We will proably go fill up sometime in the next week or two while we are at friends on the NV/VA border. I will post the results when we do. Although 1 tank full will not be a real accurate indicator, it should show an indication of any difference.  Jack

[scottwms]

meaningless?  full tank to full tank, miles using gps.