Go Back   The 75 and ZT Owners Club Forums > The 75 and ZT Owners Club Forums > The 75 and ZT Owners Club General Forum
Register FAQ Image Gallery Members List Calendar Mark Forums Read
Notices

Reply
 
Thread Tools Display Modes
Old 7th July 2019, 08:56   #21
Mike Trident
Posted a thing or two
 
Mike Trident's Avatar
 
Rover 75 CDTi Saloon & Citroen C1

Join Date: Jun 2016
Location: Oakenshaw, Near Bradford
Posts: 1,618
Thanks: 385
Thanked 552 Times in 328 Posts
Default

You can't really compare the manufacturers figures when the car is not 100% standard.

Mine has a 160 remap, runs on fully synthetic oil and always has millers additive in the fuel tank.

I have only even checked it's mileage once. A long 370 mile, all motorway drive in absolutely perfect conditions.
No wind, dry, not too warm, mostly flat, newly waxed car (Yes it does make a difference), 90% of the time on cruise control. And it totally blitzed the manufacturers figure.

Around town I have no I have no idea.
__________________
Rover 75 2.0 CDTi (131Ps) Conn SE Saloon. (Manual)
160 Remap, cruise control, electric window blind, temp gauge, Real walnut / ZT interior, FBH with GSM control.

BORN
Tuesday, 5th October 2004 @ 12:35:52
This vehicle was the 104,679th 75 to run off the production line, out of 112,381
This vehicle was the 3,318th 75 CDT Connoisseur SE (135) to be made out of 4,744
This vehicle was the 12,440th 75 in Starlight Silver (code: MBB) to be made out of 14,280 Starlight Silver 75s
Mike Trident is offline   Reply With Quote
Old 7th July 2019, 15:48   #22
Tourist
Loves to post
 
2004 Rover 75 Tourer CDTi

Join Date: Apr 2016
Location: Fulbourn, Cambridge
Posts: 454
Thanks: 105
Thanked 123 Times in 101 Posts
Default

Quote:
Originally Posted by Mike Trident View Post
I have only even checked it's mileage once. A long 370 mile, all motorway drive in absolutely perfect conditions.
No wind, dry, not too warm, mostly flat, newly waxed car (Yes it does make a difference), 90% of the time on cruise control. And it totally blitzed the manufacturers figure.

Good work - one thing I've noticed is that using cruise control seems to increase consumption so one assumption is that the system is applying the brakes to slow the car down at times to keep the speed steady.


Anyone know if that's the case?


Incidentally I've just been to St. Ives and back (a 50 mile journey), along the 40 mph roadworks. I reset the trip computer before I left and the MPG crept up to an indicated 72.4 at its best, but trafic conditions meant that it was back down to 68.9 by the time I got home. Clearly it's not actually achieving those figures, but it's definitely well over 60 and that appears to be to goal that everyone's trying to get to, so the old Rover's doing alright!
Tourist is offline   Reply With Quote
Old 7th July 2019, 16:00   #23
SD1too
Doesn't do things by halves
 
SD1too's Avatar
 
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model.

Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,266
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
Default

Quote:
Originally Posted by Tourist View Post
... using cruise control seems to increase consumption so one assumption is that the system is applying the brakes to slow the car down at times to keep the speed steady.
Anyone know if that's the case?
No, that's not the case Simon.
Smooth and gentle acceleration and deceleration is the way to minimise fuel consumption and in my experience that isn't a description that can be applied to our cruise control!

Simon
__________________
"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.
SD1too is online now   Reply With Quote
Old 7th July 2019, 16:11   #24
Tourist
Loves to post
 
2004 Rover 75 Tourer CDTi

Join Date: Apr 2016
Location: Fulbourn, Cambridge
Posts: 454
Thanks: 105
Thanked 123 Times in 101 Posts
Default

Quote:
Originally Posted by SD1too View Post
No, that's not the case Simon....

Cheers - good to have that confirmed!


And yes, you're right smooth and gentle with the accelerator and never use the brakes if you can help it!!
Tourist is offline   Reply With Quote
Old 7th July 2019, 17:32   #25
Mike Trident
Posted a thing or two
 
Mike Trident's Avatar
 
Rover 75 CDTi Saloon & Citroen C1

Join Date: Jun 2016
Location: Oakenshaw, Near Bradford
Posts: 1,618
Thanks: 385
Thanked 552 Times in 328 Posts
Default

If you manage to maintain a constant speed by reading the road well ahead the cruise is smooth. However if you have to loose 10 / 20 mph then let the cruise take you back up to speed, it fair accelerates lol.

However, something I read a while ago claimed that to get the best MPG smooth acceleration is not the way to go. It said that the best MPG is obtained at cruising speed because this is on very light throttle. So the more time it is cruising the better. It stated accelerate briskly to cruise speed (whatever that will be) and get the car into light throttle cruise mode quickly.

I have actually tried it , it totally goes against the grain, but the trip computer in the Suzuki did indeed show an improvement over the gentle (take ages to get to cruise speed) acceleration. Maybe because around town, most of the time you will never reach the sweet spot before slowing down again.

Try it! I was shocked.
__________________
Rover 75 2.0 CDTi (131Ps) Conn SE Saloon. (Manual)
160 Remap, cruise control, electric window blind, temp gauge, Real walnut / ZT interior, FBH with GSM control.

BORN
Tuesday, 5th October 2004 @ 12:35:52
This vehicle was the 104,679th 75 to run off the production line, out of 112,381
This vehicle was the 3,318th 75 CDT Connoisseur SE (135) to be made out of 4,744
This vehicle was the 12,440th 75 in Starlight Silver (code: MBB) to be made out of 14,280 Starlight Silver 75s
Mike Trident is offline   Reply With Quote
Old 8th July 2019, 11:47   #26
COLVERT
This is my second home
 
R75 Saloon.

Join Date: Feb 2009
Location: France/or Devon.
Posts: 14,003
Thanks: 3,851
Thanked 2,167 Times in 1,816 Posts
Default

Quote:
Originally Posted by Tourist View Post
Good work - one thing I've noticed is that using cruise control seems to increase consumption so one assumption is that the system is applying the brakes to slow the car down at times to keep the speed steady.


Anyone know if that's the case?


Incidentally I've just been to St. Ives and back (a 50 mile journey), along the 40 mph roadworks. I reset the trip computer before I left and the MPG crept up to an indicated 72.4 at its best, but trafic conditions meant that it was back down to 68.9 by the time I got home. Clearly it's not actually achieving those figures, but it's definitely well over 60 and that appears to be to goal that everyone's trying to get to, so the old Rover's doing alright!
The R75 cruise system does NOT apply the brakes.
COLVERT is offline   Reply With Quote
Old 8th July 2019, 12:57   #27
Phil th Barrow
Gets stuck in
 
" NOW SOLD" :-( Rover 75 Conni Auto SE

Join Date: Feb 2011
Location: Stoke
Posts: 896
Thanks: 424
Thanked 214 Times in 163 Posts
Default

Im going Devon next month. Its 4 and bit hrs drive mainly motorway and duel carriage way... Any one who can guess my round trip fuel consumption wins a free look at a raining in boot...
__________________
[SIGPIC][/SIGPIC]
Phil th Barrow is offline   Reply With Quote
Old 26th July 2019, 09:53   #28
Phil th Barrow
Gets stuck in
 
" NOW SOLD" :-( Rover 75 Conni Auto SE

Join Date: Feb 2011
Location: Stoke
Posts: 896
Thanks: 424
Thanked 214 Times in 163 Posts
Default

Ok, iv been Devon and very nice it was. 456 miles of motorway there and back. Going I was in quite a few traffic jams. Mainly Birmingham, Bristol and Taunton area. Coming back was free flowing apart from 50 mph road works. We did 253 miles down there. A lot of undulating back lines and very rarely in 5th gear on a auto box. (Mine changes up around 47 mph) Also air con on for 90% of th hole trips.


Total 709 miles at 50.17 mpg brim to brim. Im happy with that. It always seams to run better after a good trip too. It only does 4500 miles a year and never gets up to temp in th winter months on its normal duties = short trips to work and back (7 miles total, average 24 mph). That sort of work and back driving gives me 36 mpg.
__________________
[SIGPIC][/SIGPIC]
Phil th Barrow is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 07:43.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright © 2006-2023, The Rover 75 & MG ZT Owners Club Ltd