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Re: Pulse 'n' Glide style of driving

I used to drive most of my way to work in 6th gear with just a tiny bit of throttle and the fuel computer reading anything above a couple of hundred MPG. I lived at about 1000 feet and worked 15 miles of straight motorway away at about 300 ft. Thing is I couldn't get more than 35 or 40mpg on the way home when I had to climb the same hill, so overall 50-60mpg was my best average. I could get just the same with the cruise control set to 75mph on a 350 mile journey from Scotland to Birmingham, which is up and down over Dumfries and Galloway and the Lake District, with every motorway gradient in between, so I don't think it really makes much difference. It all averages out.

Wouldn't you coast further in neutral than with the clutch down? The wheels are not having to spin the driven side of the gearbox and the clutch plate.

Quote:

Originally Posted by Bluepete (Post 2468596)

I am lead to believe that with many modern engines, when the road speed is above the engine speed, the injectors turn off.

In other words, on downhills, just take your foot off the gas, leave the engine engaged and the fuel stops flowing. This gives higher mpg than coasting as the engine needs fuel to idle whilst coasting.

Pete ;)

Quote:

Originally Posted by punyXpress (Post 2468803)

But wouldn't you get engine braking?

Correct, these guys want to coast as far as possible, so engine braking is not desirable.

Quote:

Originally Posted by Ed (Post 2468734)

What if the car's automatic:confused: It's a while since I had a manual car. I don't like 'driving' in neutral as the brake servo don't work.

Just plan ahead and avoid your brakes. You burn fuel to generate speed, then when you brake you take that kinetic energy and turn it into heat. Even in an automatic, if it's modern FI, a closed throttle will shut off the injectors.

When you hit the 1/2 mile sign exiting a motorway, move over to lane 1 gradually loosing speed with your foot light on the throttle, when you see the 300 yd sign, foot off the throttle completely, and let the car slow down naturally. You'll be down to 50 mph or so by the time you hit the slip road and usually down to 15-20mph by the end of the slip don't touch the brakes unless you have to stop at the end.

With the likes of roundabouts and junctions, throttle off as soon as you see it, earlier if it's downhill, and let your car slow gradually, just the same as above. If you can watch the traffic and anticipate ahead as you approach the roundabout or junction, you can try and time it so that you don't have to brake at all, you arrive just as there is a gap in the traffic flow, and you accelerate gently away again.

Your average MPG is also directly related to how far down your foot is on the accelerator pedal, go for a 'light touch' approach with your foot, only using just as much throttle as you need, and you'll use less fuel.

Another trick with an auto box is if your feel it's holding a gear for too long when accelerating, lift your foot slightly as though you were up to the desired speed, and it'll change up a gear, then reapply throttle gently to get back up to the speed you really wanted, but not hard enough to make the box kick down again.

It'll all drive the people behind you nuts, but who cares if you are saving money.

Re: Pulse 'n' Glide style of driving

Quote:

Originally Posted by -Ralph- (Post 2468856)

With the likes of roundabouts and junctions, throttle off as soon as you see it, earlier if it's downhill, and let your car slow gradually, just the same as above. If you can watch the traffic and anticipate ahead as you approach the roundabout or junction, you can try and time it so that you don't have to brake at all, you arrive just as there is a gap in the traffic flow, and you accelerate gently away again.

BUT - there will ALWAYS be a car in front of you that will STOP, look both ways, select gear, back into neutral, look both ways . . . ad infinitum!
Why do they do that, and what traffic ( apart from bluepete chasing scrotes ) comes from the left on a roundabout?

Re: Pulse 'n' Glide style of driving

Quote:

Originally Posted by -Ralph- (Post 2468856)

When you hit the 1/2 mile sign exiting a motorway, move over to lane 1 gradually loosing speed with your foot light on the throttle, when you see the 300 yd sign, foot off the throttle completely, and let the car slow down naturally. You'll be down to 50 mph or so by the time you hit the slip road and usually down to 15-20mph by the end of the slip don't touch the brakes unless you have to stop at the end.

With the likes of roundabouts and junctions, throttle off as soon as you see it, earlier if it's downhill, and let your car slow gradually, just the same as above. If you can watch the traffic and anticipate ahead as you approach the roundabout or junction, you can try and time it so that you don't have to brake at all, you arrive just as there is a gap in the traffic flow, and you accelerate gently away again.
.

Classic IAM talk - you fancy your pipe and slippers now!

though i'd find you infuriating on a motorway if you done that - that's why its called a de-acceleration lane! ;)

Re: Pulse 'n' Glide style of driving

Quote:

Originally Posted by punyXpress (Post 2468938)

That made me laugh!!! and its always when you have managed to apply the law of Ralph!

Re: Pulse 'n' Glide style of driving

Its right, when coasting in gear, the engine is still being turned over, it doesn't need fuel so no fuel is injected. The driveshafts spinning keep the engine going.

Take it out of gear, no natural spinning, hence fuel is needed to be put in to keep it turned over.

As for Priuses, no, no clutch, boss has one and I drive it often. Front heavy awful handling car. No all that great on fuel either as its no more economical than any other 1.6 engine, and at motorway speeds it only does 40mpg odd. Where it excels is slow speed, town running. But the motor is terrible and to pull away just using electric is stupid. I'd say just using the motor, so free running, is 0-40mph in about 20 seconds. so you have to use the engine as well, knocking the economy down. He gets about 45mpg average, which is what a normal derv runs at. I've had it over 100mpg though pottering around. Dash/dials are good, but materials are terrible (recycled).

Technology on the braking kinetic power return is a good idea, but needs to be made more mainstream and available on other more powerful cars, with bigger/better brakes to return more charge to the motor.

Re: Pulse 'n' Glide style of driving

Quote:

Originally Posted by punyXpress (Post 2468938)

what traffic ( apart from bluepete chasing scrotes ) comes from the left on a roundabout?

:confused: You've lost me. Why do you ask? Did I say somewhere there would be traffic from the left?

Re: Pulse 'n' Glide style of driving

Quote:

Originally Posted by punyXpress (Post 2468938)

BUT - there will ALWAYS be a car in front of you that will STOP, look both ways, select gear, back into neutral, look both ways . . . ad infinitum!

I was behind a guy in a brand new Jag once. Every time he came to rest at a red light, his brakelights would flash.

Just before he pulled away when the lights changed, the brakelights flashed again.

He was putting it in Park every time he stopped!

Re: Pulse 'n' Glide style of driving

He's on about the idiots who can't plan ahead who get in the way when you are trying to drive smoothly

Re: Pulse 'n' Glide style of driving

Quote:

Originally Posted by yorkie_chris (Post 2468981)

He's on about the idiots who can't plan ahead who get in the way when you are trying to drive smoothly

I'm with you, he's on about people who sit there at roundabouts and look right AND LEFT. Yes, morons!

Re: Pulse 'n' Glide style of driving

Quote:

Originally Posted by -Ralph- (Post 2468979)

:confused: You've lost me. Why do you ask? Did I say somewhere there would be traffic from the left?

No, I did - post #22
Yorkie Chris has explained it.
Why oh why do people stop at a roundabout when there's nowt coming?