MPG

[TedCalvert]

'86 Prevost, 8V92T mechanical, OE manual tranny, minimal conversion as yet.

Anyone got experience on this or a SWAG?  7?

TIA

Ted.

[86102A3]

I calculated mine when I drove the bus home and I figured a little over 5mpg. My coach does not have an odometer anymore, so I had to use google maps for the distance. Also a note that I was pushing it pretty good, which will have a big effect on mpg.


Jeff LoGiudice
1986 TMC 102A3
Silver 6V92TA
Allison 740

[bobofthenorth]

'86 Prevost, 8V92T mechanical, OE manual tranny, minimal conversion as yet.

Anyone got experience on this or a SWAG?  7?

1981, 96" coach with 8V92T & a 10 speed Roadranger - so pretty similar.  42 - 44,000# Gross including the towed.

We got between 6 & 6.5 MPG but that's an Imperial gallon, not that wimpy @$# thing you guys call a gallon so probably barely 5 miles per wimpy @$# gallon.  That's over a lot of miles - 100,000++.  It went up a bit under ideal conditions (if I kept my foot out of it on the interstates) and down a lot under crap conditions (high furnace use). 

[Dave5Cs]

6v71 may be slow but 8.4 mpg is worth it

Sent from my SPH-L710 using Tapatalk

[lostagain]

8.5 miles per real gallon. 7 per wimpy a** gallon. But you know, it doesn't really matter: all you can do is fill it up when it is empty,and keep driving. Enjoy now while the price is low. It has started going back up.

JC

[Mike in GA]

My 8v92 TA with 5 speed gets a shade under 6 mpg. This fluctuates up or down a half gallon based on headwind, heavy foot, hills, etc. I am only 34,500# but always tow a Honda CRV.
YMMV - ha ha!
Mike in GA

[kyle4501]

87 8V92T, 36,000 lbs Allison 4spd, no toad.
Not too many trips yet, but so far, the results -

Pushing hard (75 to 80 mph) with gen set = almost 6mpg   

Taking it as easy as practical (55 to 65 mph) without genset = 6mpg   


The conclusion I have come to is that it really doesn't matter. The benefits of "Taking the good life with me" out weighs the cost. That & the 300 gallon capacity allows time to get over the cost from the last time I filled it up. 

When fuel mileage becomes the governing issue concerning using our coach, it will be time to sell it & get used to staying home. 

[bobofthenorth]

What Kyle said.  If you really want to cry about mileage try owning a boat - our last fill barely broke 1.5 (nautical) miles per gallon.  I'm ecstatic if I hit 2 MPG.

[Lin]

I haven't actually kept track of mpg, but I think that the EPA rates the MC5a at 18 city and 22 hwy.  I am probably getting a bit less though.

[HB of CJ]

Crown Supercoach ex schoolie.  1974, 40x8x10.5 ten wheeler.  About 24,500# stripped.  Small Cam Cummings 855 250hp with no turbo.  RTO910 Fuller 10 speed Roadranger with 3.90 gears and 12.5x22.5 tires.  About 1500 rpm at 60 mph.  Got right at 10.3 US mpg from Palmdale CA to Cave Junction OR.  Slight prevailing headwinds. Long ago.

[Ed Hackenbruch]

The last 3 fillups in my 5A with the new rebuilt engine and a 4 speed Allison were 7.88, 7.86, and 8 on the nose. 

[luvrbus]

Fuel mileage is all about weight and the right foot

[TedCalvert]

Interesting information and opinions.  Thank you all.

In my limited experience, I would have hoped for around 7, but I guess I was being overly optimistic.  I drove E-models  in charter service when they first came out, they were equipped with a display.  IIRC the company wanted us to aim for 7, 6 1/2 was more common.

The cost is what it is; nice to know for planning.

Lin, you are kidding, right?  Did the EPA even exist when the 5 was built?

Ted.

[Iceni John]

About 7-ish-ish at a steady 60 MPH (or 95 KMH, sounds faster that way), weighing about 27K now but it's not fully converted yet.   I've wondered about swapping to a 3.7 rear end, but because my bus has the aerodynamics of a brick karzi (it's not one of the Twinkie-shaped Crowns that can get up to 12 MPG) it may not mean any reduced fuel consumption if the engine's working just as hard but at 200 RPM less.   It certainly wouldn't be cost-effective, not unless I had to change the diff anyway and I got a bonzer deal on a 3.7.

John

[luvrbus]

My 8v92TA with 3:36 rear gear,740 Allison @ 39,000 was a constant 7 to 7.5 mpg set at 450hp @ 68 mph, when I would up the HP up to around 500 hp then it 5 to 5.5 mpg