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BertBert

8,270 posts

97 months

[news] 
Sunday 20th May 2012 quote quote all
rolleyes

KardioKate

Original Poster:

1,584 posts

40 months

[news] 
Sunday 20th May 2012 quote quote all
BertBert said:
rolleyes
Give us a clue... what's this for?

VinceFox

19,176 posts

58 months

[news] 
Sunday 20th May 2012 quote quote all
<homer simpson whisper>

I think he likes you

</>

Tartan Pixie

735 posts

33 months

[news] 
Sunday 20th May 2012 quote quote all
You may find this article about brake specific fuel consumption helpful. If nothing else it'll make conversations between the OP and their dad more interesting.

tl;dr - If you're going from 30 to 60 mph the most fuel efficient way is to do so with the throttle fully open but to change up before you get excessive losses from friction.

Given that I have very little mechanical knowledge, I have found this article useful in convincing myself that the most fuel efficient way to drive is to floor it in third then block change when I reach 60mph.

Which is probably bks but I'm quite happy with my delusion.

Himself

341 posts

33 months

[news] 
Sunday 20th May 2012 quote quote all
VinceFox said:
KardioKate said:
Himself said:
I fail to see how you're losing out?
You've missed the point completely.
Yeah, he's ALWAYS doing that.
I know, I just don't have the spare time to waste here. If I did I guess I'd get all the in jokes frown
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VinceFox

19,176 posts

58 months

[news] 
Sunday 20th May 2012 quote quote all
Himself said:
VinceFox said:
KardioKate said:
Himself said:
I fail to see how you're losing out?
You've missed the point completely.
Yeah, he's ALWAYS doing that.
I know, I just don't have the spare time to waste here. If I did I guess I'd get all the in jokes frown
Don't be like that, give us a cuddle.

BertBert

8,270 posts

97 months

[news] 
Monday 21st May 2012 quote quote all
KardioKate said:
BertBert said:
rolleyes
Give us a clue... what's this for?
This is a forum entitled "Advanced Driving", not "Dealing with the inevitable disagreements between parents and children"

And lest we get too serious, I'll add a biggrin

Bert

KardioKate

Original Poster:

1,584 posts

40 months

[news] 
Monday 21st May 2012 quote quote all
BertBert said:
This is a forum entitled "Advanced Driving", not "Dealing with the inevitable disagreements between parents and children"

And lest we get too serious, I'll add a biggrin

Bert
Actually I was hoping the thread might stimulate some discussion on gear changing techniques.

It didn't.

AnotherGareth

165 posts

60 months

[news] 
Monday 21st May 2012 quote quote all
KardioKate said:
Actually I was hoping the thread might stimulate some discussion on gear changing techniques.
You seemed more focused on how to use the engine, rather than gear changing techniques.

How does his fuel consumption compare with those listed on the HonestJohn Real MPGs website?

BertBert

8,270 posts

97 months

[news] 
Monday 21st May 2012 quote quote all
KardioKate said:
I honestly get better results if I get the accelerating out of the way, and then block change into 5th to cruise, than getting into 5th as quickly as I possibly can.
Ok, this is what I can find in your OP that you want comment on I think. But sadly I can't quite make out the question. That's probably because I am an obtuse (old) dipst.

So what was your question again?

Bert

R0G

4,064 posts

41 months

[news] 
Tuesday 22nd May 2012 quote quote all
KardioKate said:
BertBert said:
what's this got to do with Advanced Driving (the forum title)?
Because he is pretty much questioning the techniques I was taught in the IAM?
If driven to SAFED then there is usually a safety/mpg trade off with safety losing out
If driving to AD then safety will be maintained as well as getting better mpg than many other styles of driving

The choice all comes down to what the driver chooses to put first - safety or mpg

Ask DAD what he puts first

Mr Grayson

158 posts

61 months

[news] 
Tuesday 22nd May 2012 quote quote all
A previous boss of mine had one of those stupid management books (he even insisted on lending it to me) called "Don't Sweat The Small Stuff" [1]. That's the gist of most of the advice on here.

Seriously if you want uber MPG, you need to drive differently, pump up (or even change) your tyres, fiddle with your engine management, accelerate like an oil tanker, coast down hills, use miles of forward vision to avoid ever having to brake, and completely switch off your brain (apart from the last point).

But you're an advanced driver, and that's not how you do things. You want to be involved with the driving process. You want to make progress. You can still obtain perfectly respectable MPG figures, as you've demonstrated. The other 4 mpg (debatable since it's not even measured in the same car) is the reward for completely spoiling your driving. Don't do it. As others have said, drive your way, don't drive his car, don't enter into discussions about driving, consider leaving home smile

IMHO block changing up the box will save nothing in mpg terms, most likely, since manufacturers carefully choose the gear ratios in their cars to give smooth acceleration with reasonable economy with all gears in use. Most likely by using 3rd for longer you're wasting the economy you then achieve by using 5th, and you may be using 5th too soon to be economical, even then.

[1] - it was a crap book, don't even bother looking frown

james_gt3rs

3,305 posts

77 months

[news] 
Tuesday 22nd May 2012 quote quote all
KardioKate said:
Actually I was hoping the thread might stimulate some discussion on gear changing techniques.

It didn't.
You don't want to start another gear changing thread trust me! The hours I've lost reading the BGOL threads...

R0G

4,064 posts

41 months

[news] 
Wednesday 23rd May 2012 quote quote all
I have a 2008 1.4 SEAT IBIZA sport

At 2500 revs is does 10 in 1st, 20 in 2nd, 30 in 3rd, 40 in 4th and 50 in 5th which means I can drive using the gears and rev counter in many cases !!

I usually change up to the next gear as low as 2000 revs or up to 3500 revs depending on circumstances

2000 rev upchange if got plenty of time and save fuel by very gentle use of the accelerator

3500 rev upchange to really get a move on/progressive driving

Downchanging gears is done by block changing

Gears for go and brakes for slow - very easy to do for a learner or an advanced driver

SAFEST way to downchange in normal driving conditions is to have the car 'balanced' so no bonnet dipped and that means releasing the brake pedal to do that - it also means that both hands remain on the wheel whilst braking

That does not mean other methods are necessarily UNSAFE

R300will

3,724 posts

37 months

[news] 
Wednesday 23rd May 2012 quote quote all
R0G said:
I have a 2008 1.4 SEAT IBIZA sport

At 2500 revs is does 10 in 1st, 20 in 2nd, 30 in 3rd, 40 in 4th and 50 in 5th which means I can drive using the gears and rev counter in many cases !!

I usually change up to the next gear as low as 2000 revs or up to 3500 revs depending on circumstances

2000 rev upchange if got plenty of time and save fuel by very gentle use of the accelerator

3500 rev upchange to really get a move on/progressive driving

Downchanging gears is done by block changing

Gears for go and brakes for slow - very easy to do for a learner or an advanced driver

SAFEST way to downchange in normal driving conditions is to have the car 'balanced' so no bonnet dipped and that means releasing the brake pedal to do that - it also means that both hands remain on the wheel whilst braking

That does not mean other methods are necessarily UNSAFE
heel 'n' toe? saves the clutch a bit too and using gears to slow saves fuel as well. Is this sort of thins taught by IAM types?

R0G

4,064 posts

41 months

[news] 
Wednesday 23rd May 2012 quote quote all
R300will said:
''' using gears to slow saves fuel as well. Is this sort of thins taught by IAM types?
How does using the gears to slow save fuel???

BertBert

8,270 posts

97 months

[news] 
Wednesday 23rd May 2012 quote quote all
R0G said:
How does using the gears to slow save fuel???
Perhaps a reference to the engine using less fuel on the over-run than on tickover?

Rightly or wrongly, driving a 3.6l about, I don't get too concerned with the finer aspects of fuel consumption. If I want to save fuel, I just drive the Galaxy Diesel.

defblade

3,313 posts

99 months

[news] 
Wednesday 23rd May 2012 quote quote all
Christ, life's too short!

Put your foot down, enjoy the drive and have more time left to do more stuff when you get there.





This post is 75% serious; 25% reserved for not crashing/dying and staying near enough the limit to retain licence.

R300will

3,724 posts

37 months

[news] 
Wednesday 23rd May 2012 quote quote all
R0G said:
R300will said:
''' using gears to slow saves fuel as well. Is this sort of thins taught by IAM types?
How does using the gears to slow save fuel???
Modern engines don't use fuel when you're using the cars motion to turn the engine over i.e. rolling down a hill in gear and off the throttle. However there comes a point where the extra distance you could go if you left it in neutral outweighs the fuel you save because you would then have to drive that extra bit and use more than being at idle.

briers

736 posts

65 months

[news] 
Monday 28th May 2012 quote quote all
Your dad needs to know foot firm down on the throttle to get up to speed as quickly as possible is the most efficient way to drive. Slow acceleration means you take longer moving 2 tonnes of car up to speed.

That also means he needs to anticipate when he can give it full throttle once the car in front is far enough down the road.

Then obviously highest gear lowest rpm without labouring and cruise off throttle to slow down and light loading.


I enjoy my 350bhp and for economy drive my wife's god awful hybrid company car she's been lumbered with. Hopefully for not much longer, it's so dull you may as well play the economy game. No issues achieving 70+ mpg average. Even 62mpg on a 400 mile round trip up the m-way to north Wales. Zzzz

Edited by briers on Monday 28th May 21:03

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