9+ MPG Class 8 5 Axel Trucks with Trailers

I misunderstood his post then.

What's 1% come out to? Everyone I know that had/has that readout never gets close to what it says. I'm talking a half gallon or more difference. But then again we don't run long distances so that might make a difference?

 

On a 209 gal fill up, the usual difference for me between tank and dash is around 2 gals. With the tank being higher.

I watch my tank and dash difference closely because a problem with an injector, or a fuel drip will show up if that number varies.

To get a close match between tank and dash on a cat engine requires that the injector codes are entered correctly and that the fuel temp sensor is correct. Some of the mods that increase power do so by tricking the electronics of the engine and they will also through off the dash mpg.

 

4.49 average mpgs in my 05 kenworth w900L c-15 cat 18 speed 72 inch bunk seems a lil low but you gotta remember we haul 100k plus gross i think the lowest was 4.35mpgs when i had 115k gross 73k in the box

 

It's great that some of you guys are getting 9, 10 & even 11MPG hauling half loads with the wind to your tail going down hill. But how 'bout some realistic numbers of trucks grossing 80,000lbs plus.

 

Averaging 4.7mpg. Always heavy, off road some of the time,run wet system some of the time and fairly low rear gears(4.33). So im not expecting better than where i am. Would be nice, 9mpg

 

I did not know about messing with the ecm would throw the readout off like that. Thanks for that info!

If understood it correctly when it was explained to me. The ECM tracks MPG's differently than how we do it. We add in all time idled and run even when just barely moving. Was told the ECM doesn't count this time. I could be wrong but thats how it was explained to me and thats why the readouts never matched the numbers we calculate.

 

scania r112h

model 1980, produced in 1986 , in period between 1992-2002

was in our ownership

on mainly flat terrain with few smaller hills

during winter time truck get 9mpg always .....this is off highway truck is 4x2+3axle drawbar trailer

not very good aerodinamics , always runned on michelin tires

this economy refers on 101500lbs in one direction and 35300 as empty in other direction

truck was never maintained , except oil and filters

was never in service and 99% of all parts were from factory

specs..... 11L engine 333hp 1030lb-ft
but that engine is pretty serious very agrresive and stronger than lot engines of 360-380hp and even some 400s

10speed gearbox direct drive 3.89:1diff ratio

rated at 150 000lbs

all mechanical suspension ( no air ride this was tipper )

150milles in one direction .......

on 5 axles overloaded

 

This is another good point. Also what does everyone get when actually running the speed limit?