Correct MPG??
- Thread starter hpoolsteve
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So by the sound of it. There is nothing to worry about. Maybe I just high expectations of the mpg.
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I would say there is something a miss. When I drove the 184 I managed mid 40s and I was booting it at most opportunities. Sure with an average speed of mid 60s a 2.0 diesel should be at least 50-55mpg. That's what my friend gets from his 520d with a similar average speed.
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I would find someone with the same car and do an mpg test. Maybe go to a quiet road. Set the cruise control and film the constant mpg, do the exact speed at the same time in the other car and watch the videos side by side. Not strictly scientific but will give you an idea if it's way off. Just a guess. Tyres literally make 1-2% difference so I doubt it I will be them. Brakes? Is one dragging? If you're capable take the wheels off (particularly the rear) and look for uneven where in the pads and that the handbrake lever on the caliper isn't restricted. Also check your air filter for blockage, this can make a huge difference.
If the car was running wrong I'm fairly certain the ecu would quickly detect it so I would guess that's ok. Where has it been serviced, proper oil used?
Brand new pads and discs all round fitted last week. Same time as 4 new tyres. I still need to check the pressure in them. Will look at air filter at the same time.
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Only had the car a week. When I went to view it. It was in the ramps having the mentioned work carried out and also its first MOT.
The journey then happened last weekend.
Work carried out at a main dealer
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The journey then happened last weekend.
Work carried out at a main dealer
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I'm suprised that winter makes it worse. I get my best mpg in the winter, but I guess that's because my car is on for 10 hours a day on average so the cold start doesn't affect overall mpg much, also mine is petrol. I think it's better in the winter for me because stop start works more often and the AC isn't working very hard, if at all. I tend to leave it on and it seems to cut in and out as and when it needs to.
Did they find their mpg was lower on long journeys also in the winter?
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Motorway MPG
My wife & I are just back from a weekend break which involved driving to Dublin Airport from the far side of Belfast & back again on return. One big case of stuff & two pieces of hand luggage. The 202 mile round trip yielded me 32.8 mpg in my 280 ST. The heater/aircon & heated seats were going, as was the stereo. I wasn't being gentle. I thought after mainly city driving she could do with a stretch of the legs to blow away any cobwebs. Set off at 3am on the way down and the roads weren't busy on the way back up. Average speed of 71 point something mph on the car's computer. It's not all motorway in the north of Ireland either. That was on 97 RON from Sainsbury's. Seems odd that the FR184 doesn't come close to doubling that at that average speed. I nearly bought one. Glad the silly side took over and I didn't. My previous car was an Ibiza FR diesel. It gave seriously impressive mpg on the open road. On a long overnight trip down English & Welsh motorways it nudged just under 70 mpg.
My wife & I are just back from a weekend break which involved driving to Dublin Airport from the far side of Belfast & back again on return. One big case of stuff & two pieces of hand luggage. The 202 mile round trip yielded me 32.8 mpg in my 280 ST. The heater/aircon & heated seats were going, as was the stereo. I wasn't being gentle. I thought after mainly city driving she could do with a stretch of the legs to blow away any cobwebs. Set off at 3am on the way down and the roads weren't busy on the way back up. Average speed of 71 point something mph on the car's computer. It's not all motorway in the north of Ireland either. That was on 97 RON from Sainsbury's. Seems odd that the FR184 doesn't come close to doubling that at that average speed. I nearly bought one. Glad the silly side took over and I didn't. My previous car was an Ibiza FR diesel. It gave seriously impressive mpg on the open road. On a long overnight trip down English & Welsh motorways it nudged just under 70 mpg.
I can get 430 teaching learners at a push in a petrol, with many different drivers of all different levels. But mostly I get around 380. Most I've had is 520 but that was done in one day with one cold start. Air con is always on.
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Like I said before mate. I wasn't booting it. Never went above 80mph.
Just can't get my head around it.
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If there is a vacuum leak after the mass airflow sensor the lambda with detect lean running and ask for more fuel. You can get a vacuum leak test done with a smoke machine to detect if there is a leak. It is possible the ecu hasn't picked something like this up. Can't think of much else. Air filter is a big one also due to greater suction losses.
I'd do two things, first I'd look at the service book of the car as from memory at 40k miles this is when a major service is due on SEAT cars, could be a manky air fuel or pollen filter. Second if no lights on dash I'd still have a diagnostic scan done, there are people out there with the lug in diagnostic tools that could shed some light on matters. At this time of year 440 a tank on winter diesel isn't really that bad to be fair although 43mpg on a 350 mile trip does concern me a little - if it's motorway driving you had done I'd be looking for 50 plus average unless sat in roadworks for ages
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Some poor MPG figures can be down to the mileage on the engine. My 184 did about 45mpg average even when driving gently until it got to about 15k miles. From then it's done better and I now get 57mpg on a 13 mile run into work and about 47mpg on the way home via country roads where I drive it harder.
I also changed the air filter myself at 10k miles, no way can it last until 40k miles and for the £10 cost for a genuine part it is worth changing it sooner.
I can also recommend fuel additives such as Millers or Archoil, runs smoother and more off boost torque which helps with MPG. It will also keep injector nozzles clean.
I also changed the air filter myself at 10k miles, no way can it last until 40k miles and for the £10 cost for a genuine part it is worth changing it sooner.
I can also recommend fuel additives such as Millers or Archoil, runs smoother and more off boost torque which helps with MPG. It will also keep injector nozzles clean.
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