Have a Superb 2.0L 2011 6 speeds manual and last weekend hit a pothole with both wheels passanger side,car developed a skidding/tremor after that(doing speeds above 60mph). Yesterday managed to see a mechanic and after he lift it up we both noticed the back shock absorber is busted(leaking oil) and also verified the state of the wheels who didn't suffer any damage... Today have noticed that my Fuel range is all over the place at speeds of 70-75mph goes down very fast but doing speeds of 50-40-30mph fuel range goes down as normal...

Short story doing 70mph with 500 miles range will go down like 495-490-485-480....in just 10 miles but if i do 30-50mph the range will go up 485-490-495-500 and act normal.

Any idea? Thank you 

9 hours ago, Oache4u said:

Have a Superb 2.0L 2011 6 speeds manual and last weekend hit a pothole with both wheels passanger side,car developed a skidding/tremor after that(doing speeds above 60mph). Yesterday managed to see a mechanic and after he lift it up we both noticed the back shock absorber is busted(leaking oil) and also verified the state of the wheels who didn't suffer any damage... Today have noticed that my Fuel range is all over the place at speeds of 70-75mph goes down very fast but doing speeds of 50-40-30mph fuel range goes down as normal...

Short story doing 70mph with 500 miles range will go down like 495-490-485-480....in just 10 miles but if i do 30-50mph the range will go up 485-490-495-500 and act normal.

Any idea? Thank you 

 

What tyre sizes are you using?

 

225/40R18?

6 hours ago, Carlston said:

 

What tyre sizes are you using?

 

225/40R18?

That's pretty much irrelevant to the OP's question. The damage has happened and talking about wheel/tyre sizes is going off on an unnecessary tangent.

 

15 hours ago, Oache4u said:

Have a Superb 2.0L 2011 6 speeds manual and last weekend hit a pothole with both wheels passanger side,car developed a skidding/tremor after that(doing speeds above 60mph). Yesterday managed to see a mechanic and after he lift it up we both noticed the back shock absorber is busted(leaking oil) and also verified the state of the wheels who didn't suffer any damage... Today have noticed that my Fuel range is all over the place at speeds of 70-75mph goes down very fast but doing speeds of 50-40-30mph fuel range goes down as normal...

Short story doing 70mph with 500 miles range will go down like 495-490-485-480....in just 10 miles but if i do 30-50mph the range will go up 485-490-495-500 and act normal.

Any idea? Thank you 

 

First off, I'd suggest a thorough examination of all suspension components on that side, and check that the wheels are true (assuming you haven't already done this). An impact significant enough to burst a shock absorber could well have caused more damage and you should make sure everything else is ok before driving the car.

 

On the fuel range, I don't think what you're reporting is actually a problem. The range is computed based on recent average fuel consumption and the assumption that you will continue at this level to the end of the tank. At 70 mph you're consuming more fuel than at 50 mph and expected range is therefore going to drop. When you slow back down, the car recomputes range based on your now current consumption and it goes back up. You probably haven't noticed it before, but now that you've had a major problem your brain is seeing things from a different perspective and conflating normal (if slightly weird) vehicle behaviour with the major damage and jumping to conclusions. For all the problems this impact might have caused, I don't think this is one.

 

If you're concerned that something is damaged, you can do two things.

 

First, verify the speedometer and odometer against a GPS device (your phone would do). The fuel consumption reading (which feeds into the range estimate) is computed from the fuel injection pulses and vehicle speed/distance, and I would say that failure of speed/distance measurement is more likely, since failure of fuel injection monitoring indicates a major engine fault and the engine would not be running at all well. GPS is accurate enough to verify any problems that might exist here. On the motorway, go into cruise at different speeds and see if the GPS agrees to check speedometer (they will probably disagree by around 5 % with the vehicle speedometer being higher). While you're out for this drive, monitor the trip meter or odometer and log the distance on the GPS unit as well. These should agree more or less exactly.

 

Second, you can verify MFD fuel consumption vs actual fuel consumption. Brim the tank and zero out MFD memory 2 (this one retains its data even when the car is switched off for long periods). After using at least half the tank, refill the tank to the brim and note the fuel quantity needed to do so. Use the distance travelled figure from MFD 2 to compute the average fuel consumption from this fuel quantity. Now compare this to the average fuel consumption recorded in MFD 2: if the values agree within 15 % you're probably fine.

Would do that, usually have to drive around 40 miles a day to/from school and i was doing exactly that yesterday but will do it properly over this weekend (parts will arrive today and car is booked in). Was thinking because the shock absorber is busted that somewhat affects the performance and basically the other 3 wheels drags the affected one(i believe the skidding/tremor is a result of locking up ) or my local Sainsbury is selling ****ty diesel again (happened in the past) will put some premium to mix it up.

Thank you for your answer,will update soon

You might well have issue with ABS / ESP sensor and brake issues.

You might well have damage to the tyre that you might only see when it is off the rim.

 

....................

As to your Sainsbury  experience of old  & if they have anything wrong with diesel in the filling station tanks, there will be many many customers than you that got it so you should have simply asked them about this.

Local Facebook and other Social media would have had that showing.

The deliveries arrive in very large road tankers that might be going to several different sites and not only the one you bought your derv at.