C107, thank you for your work in cataloguing these various tests and comparisons. I have been privileged, or perhaps lucky enough, to have owned the following:
Rover P5 (3.0 litre 6cyl.) 1963 Mark2a Coupe
Rover P5B (3.5 litre 8cyl.) 1972 Saloon
Jaguar 3.8S (6cyl.) 1967 Saloon
Mercedes 220 SEb 1961 Saloon
Mercedes 300 SEL 1966 Saloon
Which was the most exciting ? The Jaguar, without a doubt. I loved the interior red leather seats, the feeling of being surrounded by luxury, the lovely sound of the exhaust system - in short, I would hop into the car many times around midnight just to savour the car and its qualities. It was just all-together except for a) lack of reliability, b) an exhaust system that could not be secured properly on account of round rubber pads that were used to hold the system in place, c) an intermediate gearhold solenoid that refused to work properly and d)in inability to tune the SU Carbies. Mixture rich in town, good on open road. Good mixture in town, too lean on the highway. In the end, it turned out the most unreliable car - perhaps my fault as I still had to learn a bit about mechanics.
Which was the most intriguing ? The 220SE, with four speed manual and a maximum torque at about 4000 rpm. Manage to stay in that band, it went like a scolded cat, not only down hill but also uphill. Even with a trailer, and motor bike on back, it would maintain 60 mph uphill from the Hawkesbury Bridge heading towards Berowra. Drop below 4, and you were done. I even gave a 3.5 V8 a run for its money in the Galston Gorge heading towards Galston. It had beautiful seats (red), especially the backseat, but terrible drum front brakes. They were always binding - probably my fault. It was a real goer.
Best cruising car - without a doubt - the 1963 P5 Coupe with the four speed box and electric overdrive. Wonderful cruising car on the open road with great economy (25mpg), and an ability to just waft along at a leisurely 80mph, in complete safety. You always knew what the car was doing, and what it wanted you to do. I bought this car in 1971, and still have it today being restored. Handling and cornering was a little better than average, but its suspension demonstrated old technology.
Little love was lost on the P5B Saloon. Bouncy front end, horribly weak and inadequate BW35 gearbox, but a great interior. Just gorgeous, and at the time was still young enough for the leather upholstery to be still in really nice condition. Later in life the quality of upholstery left a lot to be desired.
Overall, the best car - probably the 300SEL Saloon. Great suspension, extremely supple featuring Air, self levelling and fantastic family cruiser with a huge boot and comfortable, but not terribly striking, interior. Fairly heavy on fuel even on the open road (19mpg), but very sure footed handler. Suspension wise, in particular, both Mercedes models were somewhat up on the Rovers, with very solid and large wishbones (front) providing wonderful stability. The differential was bolted to the body and, again all round, far more sophisticated than the Rovers, although not that much better in overall handling. The Jaguar, in my opinion, was a bad understeerer, with far too many rubber bushes, and terrible to work on.
I must dig up some photos to illustrate the cars. Regards Styria