Green car countdown

Is this the single most important feature a car can have to encourage economical green driving?

It is, no less, an ETA for sat nav journeys. No more than that, either. Eh? The big deal is..?

This: In real time, it tells you what time you’ll arrive where you’ve said you want to be. In this instance, it’s seen on a BMW M3 Edition Coupe, but y’£100 TomToms have the very same function. With a bit of thought, it’s potentially massive.

It’s why I set sat nav to take me home. Now, Lord, even I’m not forgetful enough to forget the route. No, I instead like to know how long it will take.

Surely you know, you may ask? And yes, I do, roughly. But I like exacts, not guestimates. Particularly as, and here’s the key, my eco head sees my speed vary from day to day. Seriously. And it’s sat nav that allows me to do this in confidence.

Say I have 5mins ‘spare’. I’ll slow down a bit. Tweak the ETA. By driving more slowly, I’ll have returned more miles to the gallon. See it as a bit of real-time money-saving. In practice, it means I can be as green as possible and STILL not miss the start to Corrie.

It’s pilot mode. Whenever they’re late, what does a scheduled aircraft’s pilot say? That they’ll put their foot down and make the time up. That’s because planes are usually operating at way less than vmax – they’re flying at the EXACT speed required to reach their destination on time. No faster. No slower. This is, err, plain efficiency – both of time and of resources.

We could be doing this in our cars in the future: plugging in what time we need to be home, and letting the car cap, say, our motorway speed to only that required to achieve this. Perhaps, with layered financial penalties for those who want to go faster, within the realms of legality? Companies in particular would love this, and with vehicle tracking now all the rage, it would be particularly easy to implement.

Folk don’t like being told to do stuff slowly. But, they could be convinced to do it a bit slower, if they knew by how much they’d be penalised if they didn’t. What’s a few minutes here and there, for the prize of 5mpg and a fiver?

The Maestro of the instruments

Audi Q5 economy enough to tyre you out

Fuel economy economical with the truth?