The Audi seems to be the "HOT" car to have, right now I think. There are lots of them on the German schnellstrasse, and the females especially like to drive the big Audi convertibles.
I saw virtually no Porsches on the Autobahn, but MANY Mercedes Benz, Audi, and BMW autos there in equal number proibably. They are designed, of course to do high speeds on the Autobahn. Most of the Autobahn Polizei drive Skoda wagons now,.... passding on the right is the BIGGEST crime there...it creates chaos...
My rental Audi A6 (seen here in Kientzheim France, outside my hotel)

also had a Sat Nav I could use,
and a 2.0 turbodiesel engine and I really thrashed it hard on the Autobahn. I was there to DRIVE, so I stayed in the passing lane, and passed EVERYTHING I could (except in the speed limited parts of the Autobahn that goes through cities). But as 100 kph = 62 mph, the speedoeters are in kph only so mostly I did not know how fast I drove while there.
But checked when I got home by looking on the dual mph/kph speedometer of my US spec 560 SEC.
I found out I went from 130-160 mph D A I L Y !! And did it safely, legally, and serenely. The drivers are attentive, no texting, eating, drinking, and so on, everyone signals and drives safely and obeys the rule "Slower traffic keep to the right" and further, the Autobahn is butter smooth, even the stripes are about 50' long as in the USA they are about 39' at most, so at 150 mph on the Autobgahn it doesn't feel that fast, and the highways are banked pproperly, and much deeper; whereas in the US interstates, by comparison, the roads are often all patched up, and shallow and bumpier overall, and they are full of left lane bandits that hog the fast lane, texting, distracted, drinking, eating, drivers, often with headphones in their ears all of them to me are dangerous and inattentive and careless.
I went through driving heaven over there, thoughout the western Bavaria from Frankfurt to Munich, Bavaria and the Black Forest, through Triborg and Elzach. etc, the French wine country from Strasbourg to Colmar, Austria to the ski country out to Innsbruck, then Lichtenstein, Switerland (Zurich, Geneva etc) and into Italy a bit, bgack over into Switzerland and into Franch again, and finally back into Germany some more and left the country at the airport in Nuremburg.
Fun fun fun. Glad I did it and will go certainly plan to go back again . American drivers and American roads, really suck goats compared to their German equivalents.
Fuel alone costs about $8 to $9 per gallon for the litre equivalent in Euros, and so diesels are the the preferred variants usually;
It inspired me to get my 2011 e350 when I got home from a US dealer and trade in my '11 Subaru Outbgack on it.
But got bored with the competent e350 after 8 months and 19k and went for the new BMW.5er I bought at the end of May, which is not boring like my e350 was and the Bimmer has rolled up 13k already! It really is a driver's car for sure. Loved it for my trip to Canada a couple of months ago.
And people ask me "How come you got rid of your new Mercedes for a BMW? We always thought you LOVED Mercedes, you have 3 of them, and always drove a Mercedes..
Maybe the visit to the just-released "Gran Coupe" @ the BMW museum in Munich had something to do with it...
I would say - every time. "Well, you take TWO really good German car companies - one builds trucks and buses. The other builds motorcycles. YOU do the math."
Nothing more was necessary to say..
People ALWAYS understand why I did it.
Mein neue 5er, bj. 2013: