Another way to save . Leave your car in neutral. cars with manual transmission .
 

The technique :

Desired speed and leave the car in neutral.

By leaving the car in gear slows and you have to accelerate to maintain speed .

Leaving the car in neutral slows 3 or 4 times slower .

City at a speed of 40 km / h (24 mp/h) works great.

By road also works well if not exceeded 100km / h (62 mp/h)

On the road with a slight drop and the longest in gear loses speed.

On the road with a slight drop in neutral is gaining speed.

Do not turn off the engine to use less fuel if you leave it in neutral. The power steering and brake assist is lost.

Pros :

The car loses less speed when not accelerating.
These less time accelerating.
Less consumption. I'm not sure .

Cons :

It is not recommended to use it if there is traffic .
Speeding downhill can be dangerous.

Did anyone try?

Yes, we do this quite often. It is called engine off coasting aka EOC. When you want to carry speed, coast (with the engine running or off) and if you need to slow down, use the engine, as this shuts off the fuel to the engine. With a manual transmission, just bump start it.

I think my car is in neutral engine off more then in gear.

Lol herberpower, that technique seems vaguely familiar

What Dave said!

Im not worried about power steering and brakes.
My car doesn't need power steering it was an option. //cut//belt//
A quick bumpstart and you have full foot brake and engine breaking POWER!!
If it is an emergency you can always throw it in 3rd and slow down super quick!

This really works and I would probably get like 30MPG if I couldn't go in neutral!

Thank you for the advice, herberpower.

Today I was really surprised at how fast engine braking works. I threw the car into D3 and went from 40 MPH to 25 in a matter of seconds! I've also been coasting a ton lately and noticed that at 40-45 MPH a Civic can coast for a long time on flat ground unmodded (if there isn't a headwind I would have gone much longer).

I turned off a couple of times the engine, and dangerous to me in halting similar.

I'm not used to brake without the booster .

after reading a dirtydave makes me want to try some mechanical mods in my car.

Here a car like normal conducion dirtydave has a consumption of 26.1 MPG or worse , not of 45.5 MPG.

These days I'm driving using the deadlock .

I drive at night with the lights , fan heating, mp3 radio , and a little while the thermal window.

the temperature is 48 ° F (8 ° C )

I 'm looking at the battery, the battery is running out of charge, comprove battery and was in 12,38V

My car will not charge the battery to idle well . the idle is 800 rpm.

Do you think the idle up to 850 or 900 rpm solve the problem?

Charge the battery with a charger .

Hi herberpower!

I have to ask! What's a deadlock?

If you shut the engine off your car SHOULD still provide brake assist for at least 2 or 3 brake pedal applications before the vacuum runs out of the booster!

Unless it has a leaking vacuum booster or a check valve somewhere in the system!
( I don't know if your car has a vacuum pump or what kind of system it has)

It also sounds like your car could use a new alternator if 800 rpm is not enough to charge the battery. Sometimes a diode (or diodes) will fail, killing a phase in the alternator so it will only start charging at a higher rpm!