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Can a "bad tank" do this?


darve

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2014 Audi A5 Diesel

Since filling up there is a noticeable drop in MPG. Drive to work normally averages 60 MPG on the car computer (I know not true MPG but gives a benchmark). Same journey since the fill up and struggle to get 50 MPG.

Can notice the auto box hangs onto a lower gear which naturally won't help. Manual shifting up doesn't help as the "live" MPG drops so the higher gear must labour the engine more

Can a bad tank of fuel cause this ??? ?

Tyre pressures look ok (not checked with a guage) and it was serviced a few months ago

P.s. not very exciting I know....

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No, but you could be coincidentally going through dpf regen would be my guess

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I'll go Google DPF regen :d

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Does Mike make this stuff up?

I was thinking it could be an apg bertie issue!

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Should I do anything Mike or just let it do it's thing? Drive hard / higher revs?

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Same place. Just standard deisel

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Diesels can also be very sensitive to cold temps. Especially if fitted with auxiliary diesel powered water heater. On my disco this cuts in when ambient below 12,c

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As you mentioned in OP best check tyre pressures with accurate gauge as much colder air will have caused pressure reduction and I don't rely on the dash light to tell me.

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just googled dpf regen,every week i give my taxi a very hard rev nearly to max and the smoke that comes out the exhaust you can't see through (always do it at night or when I pass cyclists that are taking up all the road) :d but seems to drive better afterwards

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Maybe the compulsive VW lies have stopped, maybe it thinks your not looking! 3.0 V6 ? Getting 60mpg I'd suggest going a bit faster as the milk delivery behind you will be getting late :d:d:d:d ... My tiddly 1.9 PD struggles to top 45mpg on brimming the tank each time. I'm always impressed when the light comes on, I can get 56l in a 55l tank!... I digress! .

Drop in MPG could be one of millions of things. I bet it's the gyro cog loose !

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Looks like Mike was correct.... again....

20161130_224607.jpg

Gave it a hard blast for 20 miles or so and back to normal now

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Can always tell when mine is due a good blast (re gen) fan stays on for quite a while after driving. 20min over 2k job sorted 

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