A random theory..

[ravingmadman]

Another thing that should be mentioned, a mere point of physics, is that it is not the sustainment of speed, it is the acceleration to speed that burns the most fuel. An electric saw requires huge amounts of energy to get the blade up to speed, but much less to sustain the blade at speed.

Your vehicle is the same. If you idle your truck for an hour, and compare it to holding 4K RPM for an hour (not revving up and down), you'll see little difference. Hard accelleration, whether from 0-20, or 40-60 is what gobbles fuel.

Load does play a factor, such as wind resistence at 20MPH vs. 60MPH, or towing a trailer, but that's not what we're talking about. Those are constants in this equation, roughly.

 

[BlizzardX23]

Sometimes I put it in neutral and look at the info screen in the dash for Inst. Econ (gas millage)...it'll go from coasting down a hill at 30mpg to 99mpg in neutral lol...

 

[drowndindreams]

you know, sometimes i would do this. when i head home from work and take my exit on the freeway theres a good mile long hill running from the freeway to the city, and i stick it in neutral, and when i pop it back into drive, all seems well until my fuel gauge goes down a knotch

 

[inkadink]

When I was in high school my mom had a chrysler new yorker. That car was decked out in all the comforts of life, heck that car even talked to you and told you when the door was open and the fuel was getting low among other things.

One fun thing with that car was it had a real-time MPG digital display screen. I used to drive that car with my friends and we used to put it in neutral while going down long hills to see what the highest MPG the car would tell us we were achieving. We topped that thing out somewhere around 80'ish miles per gallon in neutral at idle going down long hills.

With every combustion stroke of the engine a certain amount of fuel is used. The more combustion strokes per second the more fuel you will use. So yes, idling my tahoe at 600 rpms in neutral while traveling down a hill will render you with better MPG as long as the RPMS in drive are above that number at a given speed.

If you really want the best MPG then shut off the engine while going down hill,, then you will get REALLY good MPG LOL. P.S> Then the vaccum will bleed off your power brakes and you will loose power steering and if you turned your ignition key all the way off you will lock your steering column and things get really exciting.

I think I will just keep it in "D"

 

[DesTRucTO]

**** a vespa Raving... im not worried about MPG obvuiously cuz i have a hoe, idiot! It was just a discussion that a couple friends and i had so i figuered why not hear everyone elses views on it. I get like 13.5 MPG cuz i do alot of city driving but no payment makes spendin more in gas nothing of concern

 

[Rollin Thunder]

Putting the truck in neutral down a hill is the stupidest thing you can do. I would rather spend the extra 50 cents that I didnt save in fuel at the gas pump than end up dead cause my brakes over heated and I crash and roll.

 

[rgaffney]

Definitely an urban legend

 

[95TwinTT]

No harm in going into Neurtal on hills, but I think it is in the same category as leaning forward in the seat, to gain performance.

You may have better vacuum and therefore better brake performance if needed, while the engine is doing some braking.

One of the best proven ways to gain mileage is to keep the air from going under the vehicle. Kind of tuff for a lot of you guys with raised trucks, but then again, I don’t get the impression you have a concern for mileage.

I remember a group studying mileage on Motor Homes, a few years ago. They had all kinds of test gear on board, including a fuel consumption meter. The only thing that showed a measurable gain was getting the air dam down to the ground in the front.

You guys are certainly entertaining.

 

[ravingmadman]

**** a vespa Raving... im not worried about MPG obvuiously cuz i have a hoe, idiot! It was just a discussion that a couple friends and i had so i figuered why not hear everyone elses views on it. I get like 13.5 MPG cuz i do alot of city driving but no payment makes spendin more in gas nothing of concern

I have an '06 GSXR 600, dyno proved 170MPH last summer. Vespa's aren't my thing either. And I'm with you on paying cash.