How Many Miles To A Tank Full???? - Page 3

DerekS · 17th January 2007, 22:58

During the summer I went from Crewe to Tonbridge (nr Sevenoaks) with 2 lady passengers & small amount of luggage. I returned .. same journey.. alone.
Speed southwards, almost all motorway. Consumption fill to fill 50 mpg.
Return speed .. 50mph deliberately to test consumption. exactly 50 all the way... same route, M11/A14/M1/A50. and in 5th gear.
Consumption.. using the same pumps .. another 50mpg
Now I was expecting a vastly different figure for the return. ( Rons box fitted ). So wheres the consumtion advantage of going slow ???

David3807 · 17th January 2007, 23:21

Maybe to do with the fact that the 75 is a heavy car. Higher speed gives a bit more momentum for the uphill bits.

Have found with mine (albeit Petrol V6) that around 60/65 indicated gives the best MPG if I am in the mood for economy. Knock off about 5/6 MPH cos I know that my speedo is about 10% optimistic and you arrive at at a true figure of 55/60 mph.

Funnily enough I think thats one of the speeds that are used for all the flattering MPG figures you see in car brochures. Must be coincidence :lol:

madone · 18th January 2007, 05:03

Quote:

Originally Posted by Ti Rich

Actually, with a remap and a Tu3b (on a low setting) the trip computer is only out by about 5-8%.

I bought a tunit box before Rons came out and have read before about how the box creates havoc with the computer readout. I have tested mine on 3 occassions with the comp showing averages of 29,38 and 44 MPG. Each time I double checked by the reliable brimming method and guess what the MPG figures were almost the same each time, up to half a mile out.

paulmariner · 18th January 2007, 06:51

my 2002 CDT auto with 135k on the clock regularly gives me 45mpg. In fact last weekend travelled on a round trip of 478 miles mainly A14 & A1 some at 65-70mph and some (on way home) between 75-80, but some town stuff too and afterwards filled up with 48.2l which is a typical return of 45mpg.
I always use Millers additive, never get black smoke (which was usual under load pre Millers) and it runs like a dream.

I love my motor!!

JohnDotCom · 18th January 2007, 08:10

Quote:

Originally Posted by paulmariner

my 2002 CDT auto with 135k on the clock regularly gives me 45mpg. In fact last weekend travelled on a round trip of 478 miles mainly A14 & A1 some at 65-70mph and some (on way home) between 75-80, but some town stuff too and afterwards filled up with 48.2l which is a typical return of 45mpg.
I always use Millers additive, never get black smoke (which was usual under load pre Millers) and it runs like a dream.

I love my motor!!

So you find Millers helps that much with the Diesel smoking? I cannot get it local so shall have to get it Mail Order. Have heard many good reports before on this but as car should not need it to run unsmokey have not bothered up to now. Will give it the final chance done nearly everything else.

EnEnGee · 18th January 2007, 09:19

Visited my parents in Inverness over New Year, leaving Sittingbourne in Kent on the 27th December and returning on the 2nd January. Route was M2, A2, M25, M1, M6 (+toll road), M74, M73, M80, A9, so all motorways and mostly dual carriageway. On the basis of noting the mileage between fills (to the pump fuel gun cutting out), I got 44mpg on the northbound trip and 47mpg on the soutbound trip on a distance of 620 miles each way. That was with two adults, a toddler and a moderate luggage load.

Car is a 2002 tourer CDT without mods and I am wary of the in tank fuel pump issue so don't let the car get below a quarter.

Keith · 18th January 2007, 21:27

Hmm, 50 litres thats 180-200 miles for me then :SHOCKED:

JohnDotCom · 18th January 2007, 21:30

i do hope you mean from the 260 keith not the CDT? lol.

Maxiboy · 19th January 2007, 20:34

Unfortunatly when towing my fuel consumption drops from 43mpg to 28mpg!!!!

JohnDotCom · 19th January 2007, 21:22

Quote:

Originally Posted by Maxiboy

Unfortunatly when towing my fuel consumption drops from 43mpg to 28mpg!!!!

Im not suprised when you are pulling 1500KG LOL.

Range Rovers with the 2.5 BMW diesel drop down to 20mpg doing that according to a neighbour.

At the end of the day I think you get the consumption to match your driving style and locaton at the time.

17th January 2007, 22:58	#21
DerekS Posted a thing or two Rover 75 Tourer Join Date: Nov 2006 Location: Malpas Posts: 1,526 Thanks: 34 Thanked 118 Times in 89 Posts	Explain this then Please During the summer I went from Crewe to Tonbridge (nr Sevenoaks) with 2 lady passengers & small amount of luggage. I returned .. same journey.. alone. Speed southwards, almost all motorway. Consumption fill to fill 50 mpg. Return speed .. 50mph deliberately to test consumption. exactly 50 all the way... same route, M11/A14/M1/A50. and in 5th gear. Consumption.. using the same pumps .. another 50mpg Now I was expecting a vastly different figure for the return. ( Rons box fitted ). So wheres the consumtion advantage of going slow ???

18th January 2007, 09:19	#26
EnEnGee Posted a thing or two CDT Tourer (SORN) & 2.0 V6 Saloon Join Date: Nov 2006 Location: Sittingbourne Posts: 1,058 Thanks: 2 Thanked 11 Times in 8 Posts	Visited my parents in Inverness over New Year, leaving Sittingbourne in Kent on the 27th December and returning on the 2nd January. Route was M2, A2, M25, M1, M6 (+toll road), M74, M73, M80, A9, so all motorways and mostly dual carriageway. On the basis of noting the mileage between fills (to the pump fuel gun cutting out), I got 44mpg on the northbound trip and 47mpg on the soutbound trip on a distance of 620 miles each way. That was with two adults, a toddler and a moderate luggage load. Car is a 2002 tourer CDT without mods and I am wary of the in tank fuel pump issue so don't let the car get below a quarter. Last edited by EnEnGee; 18th January 2007 at 13:46..

19th January 2007, 20:34	#29
Maxiboy Newbie MG ZT-T Join Date: Jan 2007 Location: Hereford Posts: 3 Thanks: 0 Thanked 0 Times in 0 Posts	Unfortunatly when towing my fuel consumption drops from 43mpg to 28mpg!!!! __________________ Maxiboy Max - MG ZT-T+ CDTI 150 Mrs Max - Rover 414 SL 105

17th January 2007, 23:21	#22
David3807 Posted a thing or two 2002 R75 Conn SE 2.5l Auto Tourer, 2001 R75 Conn SE 2.5 Auto Saloon Join Date: Nov 2006 Location: Gravesend Posts: 1,897 Thanks: 0 Thanked 2 Times in 2 Posts	Maybe to do with the fact that the 75 is a heavy car. Higher speed gives a bit more momentum for the uphill bits. Have found with mine (albeit Petrol V6) that around 60/65 indicated gives the best MPG if I am in the mood for economy. Knock off about 5/6 MPH cos I know that my speedo is about 10% optimistic and you arrive at at a true figure of 55/60 mph. Funnily enough I think thats one of the speeds that are used for all the flattering MPG figures you see in car brochures. Must be coincidence :lol:

18th January 2007, 06:51	#24
paulmariner Avid contributor 75 CDTi Connie Auto tourer 54 160 re-map Join Date: Nov 2006 Location: Sunny Suffolk Posts: 238 Thanks: 5 Thanked 1 Time in 1 Post	my 2002 CDT auto with 135k on the clock regularly gives me 45mpg. In fact last weekend travelled on a round trip of 478 miles mainly A14 & A1 some at 65-70mph and some (on way home) between 75-80, but some town stuff too and afterwards filled up with 48.2l which is a typical return of 45mpg. I always use Millers additive, never get black smoke (which was usual under load pre Millers) and it runs like a dream. I love my motor!!

18th January 2007, 21:27	#27
Keith This is my second home ZT400 Join Date: Oct 2006 Location: Ellesmere Posts: 5,948 Thanks: 0 Thanked 43 Times in 29 Posts	Hmm, 50 litres thats 180-200 miles for me then :SHOCKED:

18th January 2007, 21:30	#28
JohnDotCom * Rover 75 FaceLift Tourer CDTi 170BHP Auto ConnSE 2005 Model Starlight Silver Join Date: Nov 2006 Location: Abergele Posts: 28,735 Thanks: 0 Thanked 6 Times in 5 Posts	i do hope you mean from the 260 keith not the CDT? lol.