Driving on highway with lights

Slower acceleration maintains higher intake vacume inches, is the reason,for better MPG.This is fact and goes back to day one.Some old Iron had vacume(economy) gauges from the factory.And keep-it in the "Sweet Spot" when cruizin.

 

Vacuum in a DIESEL ?

Let me be the first to tell you..There ain´t NO VACUUM in a Diesel...
You claiming that slow aqcceleration with a diesel gets you better mileage are dead wrong.
D16 hit in aå+on the nail already so it´s a waste to argue IMO.
Now a Gasoline engine you have to find the sweet spot where the A/F ratio is highest comparwed to the best acceleration per BSFC (Brake Specific fuel Consumption... A Dyno term for those who doesn´t operate Dynos...)

 

YES.Intake vacume is what a naturally aspirated of either gas or diesel operates on.Turbo and blower boost come into play later.This is fact.Without a doubt.
The accel question/anwser is more important with a unit that stops often.
The "Sweet Spot" Gas or diesel is the RPM where the peak torque is produced.
Another benifit of smart operation is longer engine life.$
I know what I say.No Body can change facts...
Happy Motoring!

 

I can speak to the gas/car side of this, definitely. There are
two major sources of friction/resistance in most gas engines --
piston sliding friction (and a minor component from bearings,
valvetrain, etc), and pumping losses from sucking against the
throttle plate. The answer to item 1 is to slide the pistons
and parts less often, i.e. lower RPM. The answer to item 2 is
to get the throttle wider open. In a car, low RPM / high torque
is the most efficient state an engine can run in, and is largely
counterintuitive to the drivers because they expect the engine
to rev up when they put their foot in it. The magic, then, is
to run the gears very early in the game and keep the high
shaft load. So no, you don't want the egg under your foot,
you want to make the engine WORK but then keep it in check
with the mechanical load.

It's harder in an automatic transmission, but one can eventually
get a feel for just how hard they can push before a downshift
and once you go into TC lockup, it's easier.

You don't get throttling loss in a diesel, but I expect the
overall methodology is pretty much the same. The few things
I've read about high-MPG driving in a truck spell out the
same sort of thinking. Naturally, if you're accelerating in
higher gears, patience becomes the prime virtue but honestly,
you don't lose nearly as much overall time as it might feel
like. THAT myth has been long since busted.

-f

 

Fact without a doubt is a Diesel doesn´t produce any vacuum as there Ain´t no butterflies in the intake to cause any restriction.
Checks your facts...
Have you ever tried to measure Vacuum in a diesel...
Do that I´m waiting but I ain´t holding my breath.

Sure you do sure you do...now whos gonna prove your wrong regarding Vacuum in a diesel..you yourself or someone else gonna make you look ..well not educated at least.

http://en.wikipedia.org/wiki/Manifold_vacuum

Know thats a basic fact to know if you´ve ever done anything around engines that diesels do not have Vacuum.

IMo you ainb´t got a clue what you´re talking about either..have you actually taken a tesat and measured your consumpitons while driving ?
I´ve used gas flow meters for a few years.. done the tests with an instructor and log constantly my Mpg´s.. sofar I´ve been using 3 glns less than another similar loaded truck with similar horsepower but a more fuel stingy brand.

 

Trucking is a giving job.You give,give & give.
Nice going Mickey Fin..Keep up the Good Work.
I also TAKE this moment to say,Jack Rabbit starts waste fuel.& I have never in a thousand years EVER rode outa the Windy to The Fort I80/I69.
Trucking is A Giving Job !

 

Depends what you mean by jack rabbit starts...I suppose you mean going up in Rpms in the lower gears.
Now a brisk start saves fuel but brisk for me is to use the highest possible gear to get moving without stalling..usually thats 3rd or 5th. (in a 16 speed). then go up to 1500rpm and no more...still foot on the floor until you reach the speed where rpms hit 1000-1100 in high gear.
My average recently with my rig was 6.5mpg with and 8 axle (remember every axle equals about 6000lbs ) that has an Tare (empty) weight of 57+lbs.. fully loaded at 140+.
I wasn´t fully loaded most of the time thou 1/3rd of the trip yes but others was around 30tn.