How to get 49.5 mpg - Page 2

bl52krz · 13th June 2021, 21:16

Tyres Do definitely make a difference. My son lives in Germany. Round trip around 1100 miles. With Goodyear Efficentgrip 195/65/15, 52/53 mpg. With Avon Z5 215/55/16, 48 mpg. Says it all really.

Tourist · 13th June 2021, 23:24

Hey, congrats on the 49.5. In the past I've enjoyed trying to get the absolute best fuel consumption figures from the tourer and some time ago, the stars aligned to give me enough opportunities on a tankful to drive over 700 consecutive grandad-driving miles.

More info here: https://www.the75andztclub.co.uk/for...8&postcount=67

I managed 718 miles from one tankful, at an indicated 56.5 MPG, which turned out to be about 54 MPG once I'd done the maths.

Since then, I've put different tyres on the car and I'm no longer getting quite the same economy, and I'm not able to drive in such a controlled way either.

Today I drove from Cambridge to Chatteris with three of us on board and a bootful of kit, with the air con on 19 degrees and achieved an indicated 54.5 MPG, so that's around 50 MPG actual.

I still maintain that the figure of 60 MPG is achievable over a tankful but I don't think I'll get a chance to prove it as I'm now a father and have almost no time spare!!

There was a time, during the A14 roadworks, where the speed limit was 40 mph for miles on end that I was getting around 75 MPG indicated on several journeys to visit my parents. I never took the car back home on the same day to verify whether that figure was achieved with down hill and a following wind though.

My goal is to get 750 miles from a tankful, for no other reason that I've been told it's not possible - you never know, it may just be!!

Avulon · 14th June 2021, 13:02

Quote:

Originally Posted by MissMoppet

I've just done a 320 mile motorway run having installed the egr bypass, BMW replacement PCV AND Mr Muscle oven cleaned the manifold to achieve (IPK) 49.5mpg, 4 mpg better than I've ever obtained in 6 year's ownership. And some of the distance covered was legal speedwise.

Have the injectors reconditioned.
Best I saw on mine, single motorway journey approx 150 miles was 58mpg junction to junction. Door to door was 52mpg. Average mpg when doing long weekly runs was 49-51mpg.

gozo ken · 15th June 2021, 09:02

I had 50mpg on my diesel manual on a long run.
On my diesel Auto,I achieved 47mpg on a long run,this ,I believe is helped by switching 'snow mode' even in Summer,as it puts it in the next gear,sooner.

roverbarmy · 15th June 2021, 13:50

I used to stick an extra gallon in the tank between fill ups then when"she" asked what it was doing to the gallon, I'd get her to do the maths, gallons to miles on trip mileometer. It would often raise a smile and get a "Hey! That's not bad for a V6 is it?"

P.S. Don't tell her!

peelaaa · 15th June 2021, 19:27

My car is running mafless with re-map, used to average 44 ish, now with the inline thermostat fitted averaging 48-50 over the last few tank fulls.

Rogue · 15th June 2021, 20:56

there have been similar threads before so just copied this from one of those

Quote:

Originally Posted by Rogue

Just got back from a run to Manchester and thought i'd try and get an accurate idea of economy especially now its got the 160 map.
I brimmed the tank as i left Norwich last night and brimmed it again this evening on my way back in. Was stuck in nose to tail traffic for a hour leaving Manchester but the rest of the run was driven to the speed limits.... mostly

.
Round journey was 412 miles and i used 32.8 litres of diesel.
Now assuming my calculations are correct

32.8/4.55 to convert to gallons = 7.21 ish
412 miles/7.21 = 57.1 mpg

I am assuming that the pumps at the garage are properly calibrated and i used the same pump in the same garage at about the same time of night but i was a little surprised i was getting that sort of economy from a 160k engine and more than a little pleased

Especially as work paid me £100 to take my car.

torque2me · 16th June 2021, 07:54

Quote:

Originally Posted by bl52krz

Tyres Do definitely make a difference. My son lives in Germany. Round trip around 1100 miles. With Goodyear Efficentgrip 195/65/15, 52/53 mpg. With Avon Z5 215/55/16, 48 mpg. Says it all really.

Yep, the Avon's have more rubber on the road and thus more resistance plus a 16" wheel takes more power to move but that should be balanced out by a bigger wheel being more efficient once in a steady motion....

A left field guess might be the amount of cords/silicon/rubber mix a tyre has?

Kev

Mansfield · 17th June 2021, 23:52

On my last tank of fuel, I reset the trip and ran it down to 1/4 full. filled back to the brim and got 50 from my 2.0cdt

Sent from my SM-G981B using Tapatalk

13th June 2021, 21:16	#11
bl52krz This is my second home Rover 75 cdt club + Rover 2.5 KV6 Conni SE Join Date: May 2008 Location: Birmingham Posts: 11,385 Thanks: 6,587 Thanked 2,262 Times in 1,729 Posts	Tyres Do definitely make a difference. My son lives in Germany. Round trip around 1100 miles. With Goodyear Efficentgrip 195/65/15, 52/53 mpg. With Avon Z5 215/55/16, 48 mpg. Says it all really. __________________ Great Barr, Birmingham.

15th June 2021, 13:50	#15
roverbarmy This is my second home Roverless + 1.7D Sportage Join Date: Aug 2014 Location: East Norfolk Posts: 7,048 Thanks: 729 Thanked 2,021 Times in 1,449 Posts	I used to stick an extra gallon in the tank between fill ups then when"she" asked what it was doing to the gallon, I'd get her to do the maths, gallons to miles on trip mileometer. It would often raise a smile and get a "Hey! That's not bad for a V6 is it?" P.S. Don't tell her! __________________ Oil in my veins!

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13th June 2021, 23:24	#12
Tourist Loves to post 2004 Rover 75 Tourer CDTi Join Date: Apr 2016 Location: Fulbourn, Cambridge Posts: 455 Thanks: 105 Thanked 123 Times in 101 Posts	Hey, congrats on the 49.5. In the past I've enjoyed trying to get the absolute best fuel consumption figures from the tourer and some time ago, the stars aligned to give me enough opportunities on a tankful to drive over 700 consecutive grandad-driving miles. More info here: https://www.the75andztclub.co.uk/for...8&postcount=67 I managed 718 miles from one tankful, at an indicated 56.5 MPG, which turned out to be about 54 MPG once I'd done the maths. Since then, I've put different tyres on the car and I'm no longer getting quite the same economy, and I'm not able to drive in such a controlled way either. Today I drove from Cambridge to Chatteris with three of us on board and a bootful of kit, with the air con on 19 degrees and achieved an indicated 54.5 MPG, so that's around 50 MPG actual. I still maintain that the figure of 60 MPG is achievable over a tankful but I don't think I'll get a chance to prove it as I'm now a father and have almost no time spare!! There was a time, during the A14 roadworks, where the speed limit was 40 mph for miles on end that I was getting around 75 MPG indicated on several journeys to visit my parents. I never took the car back home on the same day to verify whether that figure was achieved with down hill and a following wind though. My goal is to get 750 miles from a tankful, for no other reason that I've been told it's not possible - you never know, it may just be!!

15th June 2021, 09:02	#14
gozo ken Avid contributor R75 SALOON Join Date: Feb 2013 Location: Lincolnshire Posts: 226 Thanks: 20 Thanked 57 Times in 44 Posts	I had 50mpg on my diesel manual on a long run. On my diesel Auto,I achieved 47mpg on a long run,this ,I believe is helped by switching 'snow mode' even in Summer,as it puts it in the next gear,sooner.

15th June 2021, 19:27	#16
peelaaa Posted a thing or two 75 cdti 2004 contemporary Join Date: Apr 2008 Location: meath Posts: 1,551 Thanks: 272 Thanked 80 Times in 58 Posts	My car is running mafless with re-map, used to average 44 ish, now with the inline thermostat fitted averaging 48-50 over the last few tank fulls.

17th June 2021, 23:52	#19
Mansfield Regular poster Rover 75 Saloon Join Date: Feb 2012 Location: Wakefield Posts: 82 Thanks: 1 Thanked 26 Times in 14 Posts	On my last tank of fuel, I reset the trip and ran it down to 1/4 full. filled back to the brim and got 50 from my 2.0cdt Sent from my SM-G981B using Tapatalk