help!!! - very low mpg

MGmike · 5th February 2012, 03:31

hi,

i have had a 2.5l V6 75 connie for 3.5 years and have loved it. she gave me nearly 30mpg all the time. doing journeys into london for work etc. when she got to 70,000miles just before xmas, i thought it was time to sell her before anything went wrong. i bought a 2004 1.8i 75 connie with 31,000 miles. it is immaculate and i thought i might get better mpg. even though she is an auto. i use the economy setting all the time. she takes 80litres or 21 gallons to fill up and i am getting only 300 miles on a tank. that means around 15mpg!! half what i was getting before, on the same journeys. is something wrong? i was expecting 35-40mpg.

any help would be appreciated. mike

MGmike · 5th February 2012, 03:56

hi. i am a wally. 78.81 was the price on the receipt. the petrol was 58litres or 12.75 gallons. so mpg is about 24. still low though. any ideas why. in heavy traffic is an auto that much worse than a manual?

thanks mike.

crashmarks · 5th February 2012, 06:27

I used to have a 2.5 Conny manual and I too could get 30 mpg on local journeys through town on my daily 16 mile return trip to work with careful driving. I now have a diesel Auto and doing the same journeys I get about 35 mpg where as other members with diesel manuals indicate well into the 40s locally. The manufacturers spec also shows a large drop in mpg when using an Auto. On a long run down the motorway the Auto is as economical as the manual but thats about the only time.

I cant speak with authority on the 1.8 but 24 seems a bit low, looking at the manual, 28 would be more like. How long are your daily journeys ?

chipsceola · 5th February 2012, 08:35

I had a 1.8 Classic, sold with 92000 on clock, average mpg around town 24/25 with mostly short journeys and some longer trips 80/100 miles each way where better at almost 40mpg. Now have 1.8T Connie Tourer (74000) and again 23mpg short runs and 38mpg + on longer journeys. Never have done commuting in heavy traffic as you do but assume no worse than I was getting with same engine and short trips.
Chips

James.uk · 5th February 2012, 15:00

>>>hi. i am a wally. <<<

Wrong club ole chap.. The people you want meet on a Thursday eve I think....

MPG is like fishing tales, they get bigger and longer every time they are talked about... lol...

...

Scribbler. · 5th February 2012, 17:20

Hi Mike Bainbridge sir, My 75 auto 2.5 KV6 only returns around 28 - 30 MPG. On long runs but; luckily as I'm retired and only clock up around 4,000 per annum it matters little. If mileage is a concern .... buy a `smart car'. (Golf buggies.) My main concern was reliability, dare I tempt fate as say this has now been achieved. ooeerrrr did I say that out loud.

Mike.

stocktake · 5th February 2012, 17:33

2.5 auto can be as low as 18mpg around town

FredSpencer · 5th February 2012, 17:48

Quote:

Originally Posted by mikebainbridge

hi,

i have had a 2.5l V6 75 connie for 3.5 years and have loved it. she gave me nearly 30mpg all the time. doing journeys into london for work etc. when she got to 70,000miles just before xmas, i thought it was time to sell her before anything went wrong. i bought a 2004 1.8i 75 connie with 31,000 miles. it is immaculate and i thought i might get better mpg. even though she is an auto. i use the economy setting all the time. she takes 80litres or 21 gallons to fill up and i am getting only 300 miles on a tank. that means around 15mpg!! half what i was getting before, on the same journeys. is something wrong? i was expecting 35-40mpg.

any help would be appreciated. mike

I think there's something iffy about what you say your tank holds. According to the user manual for our cars there is only a 65 litre (14.25 gallons) usable capacity.

Here are the figures for fuel consumption by the various engines

Urban Extra urban Combined
(mpg l/100km)

1.8 petrol manual 26.1 10.8 46.5 6.1 36.1 7.8
1.8 petrol auto 20.1 14.1 36.3 7.8 28.0 10.1
2.0 petrol manual 20.9 13.5 40.3 7.0 30.1 9.4
2.0 petrol auto 17.6 16.0 34.1 8.3 25.4 11.1
2.5 petrol manual 20.2 14.0 39.4 7.2 29.2 9.7
2.5 petrol auto 16.8 16.9 32.8 8.6 24.3 11.6
2.0 diesel manual 36.9 7.6 63.1 4.5 50.0 5.6

FredSpencer · 5th February 2012, 17:49

Quote:

Originally Posted by stocktake

2.5 auto can be as low as 18mpg around town

Even less according to the user manual.

FredSpencer · 5th February 2012, 18:00

Rather strangely these figures show that the 2.5 V6 manual does better than the 1.8 auto for fuel consumption if you compare mpg but not if you compare l/100km. How does that work?

5th February 2012, 03:31	#1
MGmike Regular poster MG ZT 190+ SE Join Date: Dec 2011 Location: Ruislip Posts: 99 Thanks: 10 Thanked 12 Times in 4 Posts	help!!! - very low mpg hi, i have had a 2.5l V6 75 connie for 3.5 years and have loved it. she gave me nearly 30mpg all the time. doing journeys into london for work etc. when she got to 70,000miles just before xmas, i thought it was time to sell her before anything went wrong. i bought a 2004 1.8i 75 connie with 31,000 miles. it is immaculate and i thought i might get better mpg. even though she is an auto. i use the economy setting all the time. she takes 80litres or 21 gallons to fill up and i am getting only 300 miles on a tank. that means around 15mpg!! half what i was getting before, on the same journeys. is something wrong? i was expecting 35-40mpg. any help would be appreciated. mike

5th February 2012, 17:33	#7
stocktake Vis Whiz Rover 75 2.5 auto Saloon Join Date: Jun 2007 Location: LEEDS Posts: 20,608 Thanks: 2,057 Thanked 3,056 Times in 1,621 Posts	2.5 auto can be as low as 18mpg around town __________________ Dave... Lost a few stones and a Gall Bladder and part of a bile duct and all of my dignity in the suppository incident

5th February 2012, 03:56	#2
MGmike Regular poster MG ZT 190+ SE Join Date: Dec 2011 Location: Ruislip Posts: 99 Thanks: 10 Thanked 12 Times in 4 Posts	hi. i am a wally. 78.81 was the price on the receipt. the petrol was 58litres or 12.75 gallons. so mpg is about 24. still low though. any ideas why. in heavy traffic is an auto that much worse than a manual? thanks mike.

5th February 2012, 06:27	#3
crashmarks Loves to post Rover 75 Connoisseur SE Tourer Auto Join Date: Feb 2010 Location: Wakefield Posts: 408 Thanks: 12 Thanked 8 Times in 8 Posts	I used to have a 2.5 Conny manual and I too could get 30 mpg on local journeys through town on my daily 16 mile return trip to work with careful driving. I now have a diesel Auto and doing the same journeys I get about 35 mpg where as other members with diesel manuals indicate well into the 40s locally. The manufacturers spec also shows a large drop in mpg when using an Auto. On a long run down the motorway the Auto is as economical as the manual but thats about the only time. I cant speak with authority on the 1.8 but 24 seems a bit low, looking at the manual, 28 would be more like. How long are your daily journeys ?

5th February 2012, 08:35	#4
chipsceola This is my second home Jaguar XF 3.0D Join Date: Nov 2010 Location: Southampton Posts: 4,364 Thanks: 119 Thanked 509 Times in 426 Posts	I had a 1.8 Classic, sold with 92000 on clock, average mpg around town 24/25 with mostly short journeys and some longer trips 80/100 miles each way where better at almost 40mpg. Now have 1.8T Connie Tourer (74000) and again 23mpg short runs and 38mpg + on longer journeys. Never have done commuting in heavy traffic as you do but assume no worse than I was getting with same engine and short trips. Chips

5th February 2012, 15:00	#5
James.uk Passed Away 2002 Pale Blue. Rover 75 CDTi Connoisseur auto. 170K miles Join Date: Dec 2008 Location: Near the M67. Posts: 14,509 Thanks: 199 Thanked 585 Times in 397 Posts	>>>hi. i am a wally. <<< Wrong club ole chap.. The people you want meet on a Thursday eve I think.... MPG is like fishing tales, they get bigger and longer every time they are talked about... lol... ...

5th February 2012, 17:20	#6
Scribbler. Gets stuck in Rover 75. Saloon. Red. V6. 2.5. Join Date: Mar 2009 Location: Poole Posts: 803 Thanks: 0 Thanked 97 Times in 22 Posts	Hi Mike Bainbridge sir, My 75 auto 2.5 KV6 only returns around 28 - 30 MPG. On long runs but; luckily as I'm retired and only clock up around 4,000 per annum it matters little. If mileage is a concern .... buy a `smart car'. (Golf buggies.) My main concern was reliability, dare I tempt fate as say this has now been achieved. ooeerrrr did I say that out loud. Mike.

5th February 2012, 18:00	#10
FredSpencer Passed Away Typhoon ZT 190+ Saloon Join Date: Aug 2009 Location: Leeds Posts: 6,833 Thanks: 0 Thanked 18 Times in 10 Posts	Rather strangely these figures show that the 2.5 V6 manual does better than the 1.8 auto for fuel consumption if you compare mpg but not if you compare l/100km. How does that work?