Average fuel on computer

robdf2 · Jul 31, 2009

As you may know my car has a drink problem , and on short journeys it registers around 8 mpg on the average computer , but even more weird is if i then get stuck in traffic you can watch the average start dropping eg starts at 8.9 then goes 8.8 , 8.7 ect after about every 30 seconds drops .1 mpg.
Does any one else do this ?
Dont see how your average mpg can drop if you standing still? and air con is off

will post a video up later.

Lippo · Jul 31, 2009

It drops cos you're still using fuel, but going nowhere. Distance travelled/time.

GainfulShrimp · Jul 31, 2009

Yeah, my average mpg drops in standing traffic too (although thankfully from a higher starting point than 8.9mpg). Stop-start traffic is always terrible for consumption though.

Poverty · Jul 31, 2009

robdf2 said:
As you may know my car has a drink problem , and on short journeys it registers around 8 mpg on the average computer , but even more weird is if i then get stuck in traffic you can watch the average start dropping eg starts at 8.9 then goes 8.8 , 8.7 ect after about every 30 seconds drops .1 mpg.
Does any one else do this ?
Dont see how your average mpg can drop if you standing still? and air con is off

will post a video up later.

are you actually having to fuel up more often and its just not dodgy sensors or mechanics?

As said if you not moving the mpg will drop. Driving through london traffic I once got 10mpg.

Fl@pper · Jul 31, 2009

robdf2 said:
Dont see how your average mpg can drop if you standing still? and air con is off.

is the engine off as well ?

short trips will kill mpg - i gave up looking at mine until i've done 10 mins driving +

andycupra · Jul 31, 2009

robdf2 said:
Dont see how your average mpg can drop if you standing still? and air con is off

are you being serious?

If you are not moving, how many miles will you be contributing to the miles per gallon calculation!?

Perhaps you are not aware than when an engine is ticking over its using fuel? (otherwise it would stall)

Lippo · Jul 31, 2009

8.9mpg is a bit extreme. Use first gear a lot?

andycupra · Jul 31, 2009

Lippo said:
8.9mpg is a bit extreme. Use first gear a lot?

easily achievable if you get inthe car, start it then drive round corner into traffic.

Lippo · Jul 31, 2009

Yeah I'll have that. Used to my tdi showing 35mph as it's first reading, but I don't start off into traffic.

Big_Mikey_G · Jul 31, 2009

Still 8.9 average MPG seems a bit extreme.

I would suggest resetting the trip computer next time you fill up and then seeing just how many miles your doing before u need to fill up again.

Calculate the average MPG from that and see what your getting.

Should give you an indication of whether you have a drinking problem or a faulty sensor.

~Mike

robdf2 · Jul 31, 2009

yes i am filling up more , lost about 120 miles a tank at the mo.
all trip computers have been re set.
when it was in for a service last week i complained about high fuel consumption , they road tested it and reported that they achieved 17mpg on 4th gear runs which they said was about right ! :wtf:

The 8 mpg my computer shows is normal traffic conditions from start and by the time i get home 4 miles it gets to around 19.

i knew ,my mpg would drop in traffic , but surely not staionary and .1 mpg after each 20 - 30 seconds? doesnt do it if my computer is in the 20's that i have noticed.

pics :

Can you please check your's guys with Cupras to see if its the same please , just need more clout with SEAT , there is a problem but you have to speak like adults to children to get them to do anything about it [:@]

Donnyboy · Jul 31, 2009

That doesn't seem right at all. I do short journeys and get mid to late 20's.

I did a 120 mile non-stop motorway/country road trip the other week and used just under 1/4 tank.

How much do you get out a tank? I get atleast 250miles, but never run it down below it saying 50miles left.

GainfulShrimp · Jul 31, 2009

My FR TFSI drops quite quickly when stuck in standing traffic - even if average mpg starts off in the 20/30s. I haven't measured it to know that it's 0.1mpg per 30 secs, but it's certainly noticeable.

Around town for only a short journey, I'm lucky to make 20mpg, but I usually get 31-34mpg average on my commute (mixed country rollercoasters, dual carriageway and some heavy traffic at the end). I don't know what's usual for a Cupra but I would agree that 8-9mpg would indicate something's wrong - that's the kind of consumption you get from a RV or Hummer, isn't it?

Fl@pper · Jul 31, 2009

robdf2 said:
The 8 mpg my computer shows is normal traffic conditions from start and by the time i get home 4 miles it gets to around 19.

i knew ,my mpg would drop in traffic , but surely not stationary

1. sounds about exactly same as my old 16v for pretty much same journey in all honesty, leave work, town traffic odd lights rarely up over 35/40 for a 3/4 mile journey shows 18-20 when i get home but 8mpg straight off dont forget is calculated on instant useage whilst pumping fuel in to control your choke

2.if the engine is running when stationary then you are using fuel so the computer calculates you are using more fuel to teh same distanxce travelled therefore less MPG so it will indeed drop

have you changed routes or work or anything recently ?

plus until the temperature gauge hit's middle i wouldn't expect to see any decent figures

UltraViolet · Jul 31, 2009

That's really bad.

I get better economy on trackdays!

& much better economy from a mid-engined car with some extra cylinders and power over your Leon.

That can't be right chap. Is it in safety mode? Running rich?

RickyD1975 · Jul 31, 2009

I usually get between 25 - 27 mpg round the doors in my Cupra and 30+ on a long run.

Good luck with Seat.......

Fl@pper · Jul 31, 2009

don't forget as said this isn't a drive round town after a run to get there it's a 4 mile run home in traffic from cold

having had to do that one month with some longer runs thrown in briefly i ended up with a full tank average of 21mpg

try warming it up and doing a steady run at 60/70 and reset it and see what figures you get

UltraViolet · Jul 31, 2009

Fl@pper said:
don't forget as said this isn't a drive round town after a run to get there it's a 4 mile run home in traffic from cold

Worst sort of driving for a car. Would be better getting a bike if journey is that short.

Fl@pper · Jul 31, 2009

UltraViolet said:
Worst sort of driving for a car. Would be better getting a bike if journey is that short.

had same thought myself - hence back on a moto-x bike for work days now - sod pedalling

UltraViolet · Jul 31, 2009

Fl@pper said:
had same thought myself - hence back on a moto-x bike for work days now - sod pedalling

Lazy git

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