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Discussion Starter · #1 ·
I was talking to a friend today who drives a 53 Mondeo ST 220 and she was telling me that cruising at 80mph, she gets about 36-38MPG. Considering that this is a 3.0 V6 petrol I was very sceptical.

Especially when im my TDI, if I cruise at 80 I only get about 36MPG. I can edge the high fourties if I keep it below 65mph but anything above this and it drops like a lead ballon.

This is constant speed, not accelerating so a heavy foot cant really be a cause. Why do others get from theirs?
 

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i got 47ish mpg in my 1.6, but that only had 60miles on the clock and i was nursing it with cruise on.. so dunno!

that was at abot 68mph as well
 

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If i cruise at 70 i average in the low 50's, on a flatish road and no wind. 80mph= mid - high forties.

Never seen under 40mpg in mine yet for a decent length run.

I find if i cruise under 65 in 6th the mpg drops even though the engine isnt being laboured. Stay in 5th under 65 for a better return?

What fuel do you use JMcQueen? I've started using shell diesel extra only from 9k, now 11k and averaging 49-51 over a tankful.
 

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Hi

When I'm travelling at 80 mph in my mk5 2.0 tdi its usually get anything from 47-53 mpg indicated on the mfd, infact I find it much easier to attain high mpg figures than in my mk4 130pd

I read something somewhere about being carefull to run it in for the first couple of hundred miles as this correctly beds in the piston ring to the cylinders, if you thrash it from the off it glazes over the cylinder honing and oil doesn't adhere properly therfore you dont get as good fuel economy and it uses a little more engine oil.

My mk4 had 2700 miles on it when i got it an exdemo (probably thrashed) it used a fair bit of engine oil and returned lower mpg than my mk5 which was new with 24 miles on the clock, and as I brought it in Scotland and drove it carefully down to London on its first trip 400ish miles it has only used 500ml of engine oil in 7000 miles so far and returns much better mpg.

I use BP ultimate Diesel only I think that might help too

I think your car need to visit the dealer as you are getting very low mpg, probably can be fixed easilly with tweak or two somewhere
 

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That sounds very good for an ST220, is that off the trip computer,or a true brim to brim check .

Yours sounds poor, I get 40 MPG long term ave on the display,( also borne out by an actual calc on fill ups) from enthusiastic driving at 80 - 85 , in a Touran 2.0 TDI, and thats a lot heavier, and has the aerodynamic qualities of a garden shed !.

I'm never sure about how accurate these in car consumption readouts are anyway.
 

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Discussion Starter · #7 ·
I've only used shell in it too and im assuming the ST was off the trip computer.

Definately seems like mine is pants in the MPG terms!![:(!]
 

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I think you should try sticking some 16" wheels on for a week or two, to rule out the possibility that running on (undoubtedly quite wide) 18s is crucifying your fuel consumption.

If this does not improve things, a trip to the dealer has to be in order as you should be getting better consumption (I hope).
 

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Hi,

I've already been to the dealer as my average MPG in my Mk5 GT TDI had dropped from ~46mpg in the first 9 months to around 39mpg in Dec & Jan. (Very significant drop-off in these months.) I find that the MFD quite accurately reflects the true MPG as measured "brim-to-brim".

Took car into dealer for a repair (see earlier posts) and at same time asked them to look at consumption and poor driver's side windscreen washer performance (dribbling!) as warranty issues. On my return, was told that both items were within acceptable tolerances! They said that my latest run to the dealership (40 miles by motorway) was consuming at ~43 mpg, but the MFD averager (in position 1) was showing 37 mpg by end of same trip.

Not happy with dealer's response (as well as repair work and ongoing service levels) so asked to see dealer principal. Was told by him that all I could realistically expect with a mix of 80mph motorway driving and town commuting would be the low 40s. They had another look at it for me and said they hadn't adjusted anything, but now getting more like what they are stating - around 43mpg on average.

I have also noticed that 70mph+ speeds really canes the consumption and also agree with the comment about keeping it in 5th until ~65. However, aggressive driving style under 70mph does not seem to adversely affect consumption that much.

It will be interesting to see if any of the remaps change these consumption profiles for the better?

Cheers,

H.
 

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JMcQueen - that certainly does sound low, you should be looking at anything from 45-53 mpg at about 80mph.

would be interesting what your dealer had to say about it.
 

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Discussion Starter · #11 ·
Well, I should be getting a remap done in the not too distant future so I might wait to see if that makes any difference
 

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Discussion Starter · #13 ·
I can get it into the 50's but only at about 60mph. I tried 80 on the way home (30 miles, varying inclines) and I averaged 38mpg.
 

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It's your 18s mate.......mine's similar.

I am going to check pressures (cold) tomorrow as i think my fronts are a bit low.
 

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Discussion Starter · #18 ·
Good job I didnt go for a set of 19's then!

What should the pressure be anyway? Does it change if you up rate the wheel size?
 
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