Now I've finished, here's a quick summary of how the F class cars performed.
Citroen C4 (Amalfi and Positano) - As said above, this went extremely well around the twisty to the extent that in one or two places it is the fastest car which is definitely FWD (i.e. isn't RWD or doesn't have an AWD swap available). The fact that most of the times I got with it are outside the top 5% is more a reflection of the small numbers of people who have run these tracks than the car's ability.
Chrysler PT Cruiser (Drag and Tsukuba) - Suprisingly good for a FWD as a drag car due to the wide power band I presume. But I was disappointed in it at Tsukuba. Yes it got into the top 5% at both ribbons, but it didn't beat the general-tune Yaris by as much as I would have expected.
BMW X5 (Speedways, Benchmark and Mugello) - I expected this to be bad, and while it wasn't terrible it didn't exactly set the world alight. Top 10% at most ovals, even a top 10% at Mugello Club. But it only really wins on acceleration. The handling is poor and while top speed is good (hence the decent oval performance), it's not class leading.
VW Golf Mk2 (Camino) - In AWD form this is definitely the leaderboard car of F Class. But in FWD guise it still set some pretty good times getting 3 top 1%'s and another 3 top 5%'s on what are traditionally more power biased tracks. A nice car to drive, if a little obvious.
Chevy Aveo (Catalunya) - Despite getting a top 1% time at the GP course and to 5%'s at the others, I was a little disappointed in this car. Despite having next to no power it wasn't too bad on the straights, just didn't quite have the grip levels of the top cars.
Chevy Camaro 1979 (Iberian) - I wasn't expecting much from this car/track combination, so was very pleasantly surprised to see 3 top 1%'s out of the 6 tracks. I've also run it online where it can just about keep up with the more usual hot hatches around here. Oddly for a muscle car, online racing has shown that this car has the advantage in the corners but loses out badly under acceleration. If I end up with it in a higher class, I think I'll have to look at taking some weight out next.
Nissan Versa (Kaido and Laguna) - This was an excellent car coming down the hill where FWD was less of an issue and the immense grip meant that I could carry lots of speed through the corners. Uphill, it struggled more, both in getting the power down and on the straights where the power just wasn't there. Overall, this lost out to Blooze's Fiesta around here, but I think that is more testament to Blooze than criticism of this car. Around Laguna it wasn't so happy - again I think it was the power deficit which caused issues here, although top 5% isn't too bad.
Mazda MX-5 (Ladera) - Probably the star car of my F Class runs. I don't particularly like Ladera, so for this car to get 5 top 1% times out of 6 tracks says volumes. It's also great fun to drive so I highly recommend this to anyone (damn, did I just endorse Warped BCG?

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Mazda Familia (Le Mans) - A car which is all over the oval leaderboards in F, and having run this I can see why. Acceleration is rubbish, but it has a very good top end speed (and I could see this being higher still if I'd done an RWD swap and used the extra PI for more power). The base PI is pretty close to 200 so you're limited in what you can do, but the stock gearing is sensible enough that you can keep the stock box and concentrate on the handling.
Ford Fiesta (Maple Valley and Suzuka) - In AWD form, this is one of the best cars to have for the twisty tracks. But, I ran it in FWD form on two of the most flowing tracks in the game. The car did good though ending up around the 1% mark on all tracks with 3 times being under the magic 1% cutoff. It might not have lots of top end speed, but if the suspension is tuned to make the oversteer manageable it can carry so much speed through corners that this becomes less of an issue, even at Maple Valley.
Pontiac Trans Am 1987 (Motegi) - What have Turn 10 done to the muscle cars

This car should have been tailor made for Motegi, what with the longish straights and tight corners demanding good acceleration. Instead it lumbered around like a bear with a hangover, and nothing I did could get a good performance out of it. OK, the times were all top 5% but apart from at the West track it lost out to other non-specialised cars.
Honda Del Sol (Nuerburgring Nordschleife) - Not a lot of power in this one, but it did have a decent top end and good grip. Once I got it turning in nicely, the times weren't too bad being in the 5-10% range for the P2P's (not bad for an FWD). It even managed a top 1% for the full track. Basically, it's a good car which pulled out a surprising performance on a track I didn't expect to suit it.
Hyundai Tuscani (Nuerburgring GP) - As opposed to this one. I expected it to go well due to the fact that the Tuscani has gone well for other people in other classes. But it just felt too heavy around here in F. The speed it carries through bends is ok, but compared to other cars you meet online it just doesn't pull strongly enough out of corners.
Ford Focus SVT (2003) (New York) - This wasn't up to much in FM2, but in FM3 it appears to be highly rated, and I can see why. With top 1% times on the new track, and top 5% on the old track it goes as well as it feels. This car is a genuine all-rounder which, although not excelling anywhere, combines good handling, acceleration and top speed.
Alfa Romeo Giulia Sprint GTA (Road America) - My heart sank when this combination came up. You need power for this track, and that is one thing this car doesn't have. But it did surprisingly well, the light weight helped under acceleration and through the corners and it ended up in the top 10%. Highly recommended.
Honda Fit (Road Atlanta) - In contrast this car disappointed me. I can only guess that it's the lack of torque which did it, but it just didn't click with the track. The fact that the Scion xD was quicker around the Club circuit says volumes really.
Mazda 2 (Sebring) - This one continues the theme of DLC cars being quicker than original ones. Even though you would expect it to really suffer at Sebring, the times were very good. Around the full circuit it blitzed the '87 Trans Am by a couple of seconds while also getting a top 1% time at the short version.
Toyota Yaris (Sedona) - Yet another combination which seems bad on paper. Yet the Yaris proved surprisingly adept around here as it carried enormous speed through the corners, even with this power build. The oval section obviously didn't help this car, but it came top 1% at 3 of the 4 tracks. This and the Corrado's performance suggest to me that with careful tuning and driving, it is possible for a 2WD to take the battle to a 4WD car in some places.
VW Corrado (Sidewinder) - No doubt most people seeing this on the leaderboards will assume it is another 4WD swap, but it's actually FWD. The percentages appear pretty unspectacular being above 10% for all tracks except Sidewinder I (1-5%). But that is almost certainly down to the low numbers running these tracks - in reality it ran between about 150-300th place here.
Porsche 914/6) (Silverstone) - I put as much power into this as I could, and it still felt overgripped and underpowered. It couldn't match the 4WD Golf (wish I'd never built that) around International, but in general I was quite pleased with the performance of this.
Lotus Elan (Sunset Peninsula) - Good for twisty tracks, but that wouldn't help here. However, it produced a decent amount of speed on the straight (about 125mph) and held a lot in the corners such that it was top 400 on a couple of tracks. Very pleased with how this one turned out.
