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Miles per gallon

S

SVcummins

Well-known Member
Up to 5.31 mpg . The best the old truck has ever done .
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350 . The first day was 1,77 mpg . I had accidentally put corn squeezins in it the time before and then parked it for a few weeks
 
This is a good running engine its 4 miles up hill on the sand run and the 4.4 more of flat and that ol sand is heavy run 2 low and 2 high and 3 low for most of the uphill with the hammer right down on the floor pan and never missed a beat
 
Do you have a two speed axle ? I used to always get 8 miles per gallon full or empty with my F800/ 429/ 5 speed-2 speed axle. Cost a lot to drive a heavy truck nowadays. I had a buddy that ran all diesel/air brake school buses. He switched to gas/ juice brake/automatic transmission buses, because the DEF made the diesel buses so unreliable. No one want a bus load of kids stranded on the side of the road. And much easier to recruit drives with automatic transmission, because no one learns to drive standard anymore. And air brakes need a special endorsement on your drivers license here, anyone can drive juice. Things are going backwards 50 years
 



I used to get a consistent 6.5 mpg with my 2003 IH 5900i tri-axle dump with C-15 Cat. I didn't load heavy, usually 22 tons.
 
In my area of NY some of the schools are going back to gas engine bus , but sticking with air brakes. The gas engines are doing well so far compared to the newer diesels with all the emissions controls. Fuel costs per gallon are close, as compared to diesel being half the price/gal back when everyone began switching away from the gassers. Also mpg is alot closer as the new fuel injected gas engines do well compared to the new diesels . The gas engine buses are cheaper to buy and maintain, and do not need to have block heaters if parked outside , and will not throw all kinds of codes every morning if parked outside when it is real cold out at night. The schools with indoor bus storage where it is kept little warmer have much less trouble with the cold start issue compared to where the bus sets out all night.
 
I can't remember when E10 became EPA mandate in my hood. 30-40 years?
I've never used Heet again.
I've never see any condensate in tractors or movers tank..
 
One of the biggest advantages of automatic transmissions is less experienced drivers can focus on what is happening outside and around the vehicle rather constantly shifting the transmission. School bus drivers have plenty of other distractions to worry about.

I don't think U-Haul, Penske and other moving truck rental companies ever bothered with diesels or air brakes and they dropped manual transmissions decades back. Their fleets are now all gas engines, automatic transmissions and hydraulic brakes too. They need something that the majority of renters can drive with the fewest problems. School bus companies have similar needs, they have trouble recruiting drivers. School bus driver applicants come from all walks of life, few are professional drivers.
 
Father-in-law used to commercial truck from the late 40's clear up to the '70's when deregulation occurred. This was in rural SD. Primarily livestock & grain. Early truck I remember when I started dating his daughter while in HS was a 2 ton flat nose IH. Don't know how many miles it had on it, but I am sure it was a ton. Before we married he started driving Chevy's. He would trade every couple of years @ about 100,000 miles. He'd always said when he needed to put new brakes, it was time to trade. His last truck looked like SV's. It had a 366 engine.
 
Yup but as Geo th mentioned , with the e-10/gas mix we get here the ethanol takes care of that problem. One of the positive things about the ethanol in gas, at least for us northerners. I can remember adding dry gas when you filled your vehicles, and having ice in the sediment bowl of the gas tractors in wintertime.
 
Yes it has a 2 speed . Ive never seen a gas pickup get 8 mpg under load anyway . Those new diesels have a lot of problems with all that emissions junk .
 
A diesel gets way better mpg than a gas engine. My one ton
Trucks at 30,000 Pounds will get 11 mpg all day long . This is
a fun old truck to drive though I like the sound of gas engine
working hard
 
Way back in the early 60's when i first sat in the big seat of the B model Mack she was gas powered and pulled the fifty ton Rodgers low boy , the company only had a couple diesel powered big trucks . The Mack carried around 185 gallon of gas . When we first started to make the move to the start on the Interstate job she was gas and it was around 290 miles from the main shop and yard to the marshaling yard we were setting up the year before we started work The first time i hauled the dozer i was to run the Mack hauled it in one chunk . 14 foot wide blade cab and three shank ripper just under the fifty ton rating of the trailer . No interstate to run on back then just the old state and U S highways thru all the small towns up and down hills around sharp curves . Took between 12 -13 hours . Leave the shop with full tanks and get to the job site with under a 1/4 tank . Unload go to the Motel get a nights sleep next morning check the truck over and fill it and head home and in 7-8 hours be home with just under a half tank. For her day she was a monster Big six cylinder with a Big holley 4 bbl . That winter she was switched out to a Mack Diesel with a added turbo . That took two hours off the drive down due to the added pulling power on the hills . Now you were FLYING up the hills a a mind blowing 18-24 MPH instead of the 7 -14 MPH and wow were were now over 4 MPG instead of the 2.5 to 3.5 . The down side was the loss of the top speed due to the limited top RPM from 3850 with the gas now down to 2450 with the diesel . Not that we ever even got the gasser flat out but it did trim her wings to a 64 MPH flat out and that at times was where i would let it hang out empty , kept the dust off the trailer ya see.
 
So you like the sound of the carb pulling gas out of the tank?
Can't really describe the real sound or I would be blocked from posting.
Or go poof like my post to futures gas prices.
Who got that post poofed?? I've been busy today.
 
E10 is not and never has been EPA mandated. E10 is the result of overproduction of corn squeezins because of the poor sales of E85.

this is all covered in the renewable fuels act of 2007.
 
(quoted from post at 11:03:46 11/17/21) Way back in the early 60's when i first sat in the big seat of the B model Mack she was gas powered and pulled the fifty ton Rodgers low boy , the company only had a couple diesel powered big trucks . The Mack carried around 185 gallon of gas . When we first started to make the move to the start on the Interstate job she was gas and it was around 290 miles from the main shop and yard to the marshaling yard we were setting up the year before we started work The first time i hauled the dozer i was to run the Mack hauled it in one chunk . 14 foot wide blade cab and three shank ripper just under the fifty ton rating of the trailer . No interstate to run on back then just the old state and U S highways thru all the small towns up and down hills around sharp curves . Took between 12 -13 hours . Leave the shop with full tanks and get to the job site with under a 1/4 tank . Unload go to the Motel get a nights sleep next morning check the truck over and fill it and head home and in 7-8 hours be home with just under a half tank. For her day she was a monster Big six cylinder with a Big holley 4 bbl . That winter she was switched out to a Mack Diesel with a added turbo . That took two hours off the drive down due to the added pulling power on the hills . Now you were FLYING up the hills a a mind blowing 18-24 MPH instead of the 7 -14 MPH and wow were were now over 4 MPG instead of the 2.5 to 3.5 . The down side was the loss of the top speed due to the limited top RPM from 3850 with the gas now down to 2450 with the diesel . Not that we ever even got the gasser flat out but it did trim her wings to a 64 MPH flat out and that at times was where i would let it hang out empty , kept the dust off the trailer ya see.
Click to expand...


Vet, which model was that B? 81?
 
(quoted from post at 19:43:43 11/17/21) We still have an old Mack at work with a triplex, me and one other guy are the only ones who can drive it
Click to expand...


J Hamilton, are you and the one other guy able to start and stop that old Mack without using the clutch or only when shifting between gears?
 
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