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Old 2nd October 2010, 09:59   #11
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Quote:
Originally Posted by SD1too View Post
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.
He aslo doesn't say where its driven, load carried, saloon or tourer.

20mpg for an auto tourer driven entirely around town is probably not unthinkable.

Ron
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Old 2nd October 2010, 16:03   #12
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Originally Posted by keir1163 View Post
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.
hi keir, is there anything i can do about limp home mode? please i would be gratefull for any advice ;
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Old 2nd October 2010, 16:09   #13
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hi all , what is limp home mode? and also i know what you say is correct about b t b, but i would not like to put 360 PLUS IN TANK TO REACH THE SAME ANSWER, MUCH BETTER SPENT TOWARDS CURE, thanks peter
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Old 2nd October 2010, 16:15   #14
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hi all , i think i should let you know the 75 is 1.8 t petrol. 60 thou on clock, as i say any advice is good advice thanks peter
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Old 2nd October 2010, 16:18   #15
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Unless you use the brim to brim method to work out the exact mpg, anything else is just guesswork.

Also, as mentioned earlier, what are the driving conditions? Long run or town/city driving? Stop & start commuting will hammer the mpg.

When was the car last serviced ~ whats the air filter like? Tyres correctly inflated?
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Old 2nd October 2010, 16:23   #16
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i think iam crossing between threads here, NEW TO THIS, but can someone tell me how to get out of limp mode , or have it checked please , peter
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Old 2nd October 2010, 23:26   #17
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[QUOTE=flyer_phil;595539]Hi


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.



Heard recently on Top Gear when he was testing a sports Merc I think it was, that the twin turbo's suck over a 125 bhp. out of the engines power to run!!!!
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Old 3rd October 2010, 08:16   #18
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Originally Posted by aug081451 View Post
hi all , what is limp home mode? and also i know what you say is correct about b t b, but i would not like to put 360 PLUS IN TANK TO REACH THE SAME ANSWER, MUCH BETTER SPENT TOWARDS CURE, thanks peter
You do not necesarily need to use up an entire tankful on the experiment. Obviously the more you use, the more accurate the figure becomes, but all you need to do is brim the tank stopping at the first click then make a note of the mileage.

You then drive it far enough to make it a worthwhile distance for topping it up again and take it back to exactly the same petrol pump/ same side of the pump and brim it as before, exacept this time you make a note of how many litres you put in and the new mileage figures.
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Old 3rd October 2010, 08:23   #19
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i think iam crossing between threads here, NEW TO THIS, but can someone tell me how to get out of limp mode , or have it checked please , peter
Limp home mode is a condition where one (or more) of the engines sensors has failed or producing silly input to the engines computer. Some sensor failures can be compensated for by the engine management system using default figures and allowing the engine to still operate in a 'limp home' mode - but the engine will not perform well and it will affect the fuel consumption.

To have it checked, you need to take it to a garage which has suitable diagnostic equipment. Another alternative is that you can buy a diagnostic adaptor to plug into your PC - look up 'ELM 327'.
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Old 3rd October 2010, 14:52   #20
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thanks for the replies, i think i understand it all a bit better NOW, but the engine did feel slugish, and of course a LOT of fuel was used, i think it only did 15 mpg! i will try to get diagnostic DONE asap thanks again peter
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