I've been testing the driving method called "coasting" or pulse-and-glide by the hypermilers, as a method of saving some diesel.

Whereas in my diesel Jag. S-type back wheel drive this method made no measurable difference (using the ZF six-speed autobox), in the five-speed Chrysler autobox driving the diesel GV's front wheels, I can say there definitely IS a measurable difference as indicated by the pretty accurate MPG average readout, although I can't quantify it ATM. We may be looking at a 5% saving.

Just so you economy types know....

Leedsman.

n.b.
Naturally, no-one here would dream of switching off the engine during coasting; we all know the powered steering and assisted braking would be lost. Slipping into neutral for coasting would be all we would ever do...

 

Hi Leedsman

My 2.5 diesel manual voyager has a coasting button as part of the cruise control ive never used it but what does it do ?

Pete....

 

The coasting button lets the speep drop until you release the button, at which point it will then maintain the current speed.

Regards
Richard

 

AH! I didn't know that. thx

 

It's amazing what else you find out on here on something you just take for granted.

 

- cruise only comes on at 30 mph
- the top accelerate / resume button speeds cruise up at any speed above 30 mph
- the bottom coast button slows cruise down

- the coast button disengages [while pressed] and re-engages [when you take your finger off] cruise
- tapping the coast button will decrease your speed by 1 mph for each tap
- tapping the coast button three times will decrease speed by 3 mph" !

- tapping the acccel / resume button once will result in a 2 mph speed increase
- tapping the acccel / resume button three times will increase speed by 6 mph

- the brake will also disengage cruise, pressing the acccel / resume button will re-engage cruise at the original setting
- If you want a different cruise speed press the set button again

I use cruise 99% of all out of town centres all of the time, it seems to average about 500+ RPM [-] for any speed setting. I believe that no human can out-think a puter, we just cant make 100 throttle calculations per second. The only issue I have is that heavy traffic and fluctuating speeds and icy conditions make it a very dangerous and unforgiving device.

 

I take it that's a typo

 

You are correct Al it should and does elsewhere read "- tapping the acccel / resume button three times will increase speed by 6 mph" the line "- tapping the coast button three times will decrease speed by 3 mph" !