Is my Road Pilot GPS system more accurate than my speedometer?

I have recently taken a subscription for Road Pilot, which warns one of speed cameras and shows my speed on my iPhone (which is fixed onto my car windscreen). I notice that typically my car speedometer...

Trader won't give refund over dangerous van - what are my options?

I have recently purchased a 2007 Fiat Ducato from a trader. Within a day of buying it, the clutch pedal started sticking and the speedo would only work intermittently. I had the van inspected by a local...

Why can't we have more accurate speedometers fitted to modern cars?

Now that we have better quality sensors and electronics, is it not possible for car manufacturers to fit accurate speedometers? On a section of road works where the speeds are closely monitored, most drivers...

Dealer has reset mileage to zero after service - what can I do?

During a recent service on my 2010 Hyundai i30, the dealer told me that the digital instrument binnacle display was flickering and needed to be replaced under warranty. I was happy for the work to be done,...

Speedometer fault on Ford Focus - what's the cause?

I have a 2001 Ford Focus 1.8 petrol. The car has covered 71,000 miles and is suffering from a speedometer fault. The issue is intermittent and it will stop for a few miles then start working again. Do...

Are you encouraging people to break the law?

Under the heading 'Purring along' you seem to advocate driving at a steady 75mph on a motorway. I am under the impression from the Highway Code that the maximum speed on motorways and dual carriageways...

Is my Volvo XC60's TomTom more accurate at measuring speed than the cruise control?

When the cruise control on my Volvo XC70 is set at 60mph the TomTom says I am doing 58/59. When setting the cruise control to 61mph TomTom says I am doing 60. Which is likely to be more accurate, please?...

Most accurate way to gauge speed?

What is the most accurate way to measure my speed? Not the speedometer, obviously. But is using the rev counter RPM times the top gear ratio (20.2 mph/1000rpm) in my car a more accurate figure than the...

Do I need to recalibrate my speedometer when fitting smaller wheels to my Ford Mondeo?

I have a Mondeo Ghia 2.5T with 18-inch wheels and am seriously considering wasting some of my children's inheritance by switching to 17-inch (plus tyres of course). My concern is that a Ford main dealer...

Is the trip meter as inaccurate as the speedometer?

I filled up today and started to calculate my mpg using the trip meter reading, when it occurred to me that it is probably as inaccurate as the speedometer itself (in my case about 7-8per cent optimistic)....