Where did my 26km go?

I’ve lost 26km!  At least, that is what the on-board computer is now telling me.

OK, here’s what happened: I filled up on Friday with bio-ethanol before I went away for the weekend.  With a full tank, the computer calculated that I had 448km remaining, and no longer 474km.

Now, I know this is only a rough estimate and averaged over my usage, but that’s still quite a leap.

Whilst out over the weekend, I think I may have found the answer: whenever I start car, the air-conditioning automatically switches on.  I compared the fuel consumption figures and turning off the air-conditioning saves about 2 litres per 100km, so if I don’t turn it off every time I start the car, I am using more fuel than necessary.

I wonder if there is a way to turn it off permanently, at least until I want it on.  Or is there a reason to have it on all the time?

Oberwesel

This is the fifth part of the series about my weekend walking between Rüdesheim and Oberwesel. Part four can be found here.

The next day started with breakfast at the youth hostel (Jugendherberge). The youth hostel in Oberwesel is very modern, with en suite rooms and even a swimming pool and bistro in the basement.

oberwesel1.jpgThe youth hostel in Oberwesel

Leaving the youth hostel, we crossed the wooden bridge to the castle that overlooks Oberwesel. From here, there was a magnificent view down towards the river. In daylight you can clearly see which parts of the castle have been modernised.

oberwesel2.jpgSchloss Schönburg

Rather than zig-zagging downwards through the woods on the path that we had taken the night before, we decided to use the Elfenley – a footpath that passes behind the castle and then carries on down behind the roofs of the houses towards the town centre.

oberwesel3.jpgThe start of the Elfenley (Fußweg zur Stadt)

The path is narrow and in places there are handrails on the side to hold on to. At one point there was no handrail and it became very narrow, uneven and steep – you need a good head for heights for the first part after leaving the castle grounds!

oberwesel4.jpgPart of the Elfenley behind the castle, leading downwards to the town centre

As we descended, the town and the river came ever closer. It was a strange feeling to be standing on the same level as the church tower! The path continued to wind it’s way around the face of the hill, until, at an electricity sub-station, it ended and we found ourselves on one of the streets in Oberwesel.

OberweselThe view of the church and the Rhine from the Elfenley

From here, we headed towards the river and crossed the main road by footbridge. At the river, we found the landing stage for the Köln-Düsseldorfer boats and bought tickets for the return journey to Rüdesheim.

oberwesel6.jpgThe boat approaches the landing stages in Oberwesel

Soon the boat came into view and we went on board and found a table. Now we could sit back and enjoy the journey…

474km

My on-board computer has finally calculated that I can drive 474km on a full tank of bio-ethanol. This is only 77% of the distance, that I used to manage of a full tank of petrol.

I knew in advance that this was going to be the case, but now I have figures to back it up.

In other words, I need 30% more litres of bio-ethanol than petrol to travel the same distance.

Since bio-ethanol costs 0.899EUR per litre, a 30% increase means an effective price of 1.16EUR per litre, which compared to around 1.42EUR for super (95 octane) at the moment, is still a good bargain.

It’s just a shame, that I have to fill up so often!

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