fuel

aug081451 · 1st October 2010, 16:31

hi all. i have just bought a 1.8t auto, but it seems to be using a awfull lot of FUEL , has anyone got any advice how to improve MPG, THANKS peter

Dave Goody · 1st October 2010, 16:36

Quote:

Originally Posted by aug081451

hi all. i have just bought a 1.8t auto, but it seems to be using a awfull lot of FUEL , has anyone got any advice how to improve MPG, THANKS peter

MMM how much is an awfull lot? [in mpg please]

aug081451 · 1st October 2010, 17:01

hi dave, thanks for the reply, i might only be getting 18-20 miles per gal, peter

Dave Goody · 1st October 2010, 20:05

Only way to check accurately [ignore the computer] brim to brim. so check mileage fill tank run till amost empty, fill tank again, check mileage and work out mpg. 20 mpg very poor for that engine so do a brim to brim and come back to us. Dave

92 squadron · 1st October 2010, 20:42

Quote:

Originally Posted by aug081451

hi dave, thanks for the reply, i might only be getting 18-20 miles per gal, peter

Are you sure you changed out of first gear!

Only kidding but that is bad MPG

aug081451 · 2nd October 2010, 07:14

hi all, yes i thought it was poor, but waited till fuel tank light came on then put £20 in, drove it a couple of days , and it came on again, i had done 76 miles, does it need a service? peter

keir1163 · 2nd October 2010, 07:22

i would suggest a leak cos that is aweful!
only other thing i can think of is that the ECU is in limp home mode and compesating by overfuelling.

flyer_phil · 2nd October 2010, 09:07

Hi

I thought I might add my twopenneth.

Its true on the surface that 18-20 mpg from a 1.8 litre engine doesn't seem too good. However don't forget that the 1.8 turbo produces a lot of power - and power has to be paid for. I am not familiar with this engine (I have a diesel) but I seem to recall it produces around 160 bhp. So the economy really is a statement about power not capacity. Also it is an automatic.

For example years ago I had a Pontiac Firebird which I had brought with me on returning from the USA. It had a 5 litre V8 with a manual gearbox. People use to disbelieve me when I told them I got 26mpg in mixed driving and 30 mpg on a run.

However the reason was that it was a big lazy V8 that produced only 175 bhp but a huge 300 ft ilbs of torque and only revved to about 4000 rpm. Had it been an automatic, that would have lost me 3-4 mpg say therefore 23 - 24 mpg.

Now I know people are going to start on about turbo efficiency etc, but I would have thought that you would not get more than about 23 mpg.

I know someone recently bought an Mazda MX5 automatic which also has a 1.8 turbocharged engine producing a lot of power. He too was disappointed at the 20 mpg he got and sold it.

Still I'm sure there will be lots of people on this forum that will be able to advise you on the correct figures you should obtain.

SD1too · 2nd October 2010, 09:13

Quote:

Originally Posted by aug081451

... waited till fuel tank light came on then put £20 in, drove it a couple of days , and it came on again ...

Peter,

You cannot judge fuel consumption accurately using that method. You need to use the "brim to brim" method as described by Dave Goody, and the more fuel you use for this test the more accurate the result will be.

Simon.

HarryM1BYT · 2nd October 2010, 09:25

That figure is very poor, I could get 27mpg on a decent run in my 3l V6 auto. I could beat your figure by 5 to 6mpg even when towing my caravan. As others suggest do a brim to brim check on the litres consumed and the mileage done, convert to mpg - then get back to us.

1st October 2010, 16:31	#1
aug081451 Regular poster rover 75 saloon Join Date: Jan 2010 Location: st helens Posts: 93 Thanks: 0 Thanked 0 Times in 0 Posts	fuel hi all. i have just bought a 1.8t auto, but it seems to be using a awfull lot of FUEL , has anyone got any advice how to improve MPG, THANKS peter

1st October 2010, 20:05	#4
Dave Goody This is my second home 15 years of 75s & ZTs now an XTrail Join Date: Nov 2006 Location: Danbury, Essex Posts: 3,761 Thanks: 18 Thanked 88 Times in 56 Posts	Only way to check accurately [ignore the computer] brim to brim. so check mileage fill tank run till amost empty, fill tank again, check mileage and work out mpg. 20 mpg very poor for that engine so do a brim to brim and come back to us. Dave __________________ ZT 190 X Power Grey The Only Colour is this Dark Silver!! When I was a kid I was scared of earwigs because I thought they actually lived in your ears. I was even more terrified of cockroaches!

2nd October 2010, 07:22	#7
keir1163 Loves to post MG ZT+ CDTi Join Date: Jul 2009 Location: castle hedingham Posts: 476 Thanks: 0 Thanked 4 Times in 2 Posts	leak i would suggest a leak cos that is aweful! only other thing i can think of is that the ECU is in limp home mode and compesating by overfuelling. __________________ Let Battle Commence

2nd October 2010, 09:07	#8
flyer_phil Loves to post Rover 75 CDT Classic, 2003, Moonstone Join Date: Mar 2008 Location: Chesterfield at the moment Posts: 411 Thanks: 0 Thanked 1 Time in 1 Post	18 - 20mpg Hi I thought I might add my twopenneth. Its true on the surface that 18-20 mpg from a 1.8 litre engine doesn't seem too good. However don't forget that the 1.8 turbo produces a lot of power - and power has to be paid for. I am not familiar with this engine (I have a diesel) but I seem to recall it produces around 160 bhp. So the economy really is a statement about power not capacity. Also it is an automatic. For example years ago I had a Pontiac Firebird which I had brought with me on returning from the USA. It had a 5 litre V8 with a manual gearbox. People use to disbelieve me when I told them I got 26mpg in mixed driving and 30 mpg on a run. However the reason was that it was a big lazy V8 that produced only 175 bhp but a huge 300 ft ilbs of torque and only revved to about 4000 rpm. Had it been an automatic, that would have lost me 3-4 mpg say therefore 23 - 24 mpg. Now I know people are going to start on about turbo efficiency etc, but I would have thought that you would not get more than about 23 mpg. I know someone recently bought an Mazda MX5 automatic which also has a 1.8 turbocharged engine producing a lot of power. He too was disappointed at the 20 mpg he got and sold it. Still I'm sure there will be lots of people on this forum that will be able to advise you on the correct figures you should obtain.

1st October 2010, 17:01	#3
aug081451 Regular poster rover 75 saloon Join Date: Jan 2010 Location: st helens Posts: 93 Thanks: 0 Thanked 0 Times in 0 Posts	hi dave, thanks for the reply, i might only be getting 18-20 miles per gal, peter

2nd October 2010, 07:14	#6
aug081451 Regular poster rover 75 saloon Join Date: Jan 2010 Location: st helens Posts: 93 Thanks: 0 Thanked 0 Times in 0 Posts	hi all, yes i thought it was poor, but waited till fuel tank light came on then put £20 in, drove it a couple of days , and it came on again, i had done 76 miles, does it need a service? peter

2nd October 2010, 09:25	#10
HarryM1BYT This is my second home 75 Contemporary SE Mk II 2004 Man. Sal. CDTi 135ps, FBH on red diesel, WinCE6 DD Join Date: May 2010 Location: Leeds Posts: 17,273 Thanks: 2,160 Thanked 2,061 Times in 1,586 Posts	That figure is very poor, I could get 27mpg on a decent run in my 3l V6 auto. I could beat your figure by 5 to 6mpg even when towing my caravan. As others suggest do a brim to brim check on the litres consumed and the mileage done, convert to mpg - then get back to us.