I guess I have an initial 300+ miles drive start over you, Victor (and you don't tow a caravan). But if you ever get the chance for a few days over there, with the car - perhaps via Eurotunnel - you might just enjoy it. Didn't see any lane hogging on dual carriageways - they overtake, signal and pull back in every time.
Diesel varies as it does over here. Shell fuel was as rare as a bloody steak, but Total was available in the independent service stations at about 1.50 Euro a litre, with attended service. Every town or large village seems to have a supermarket with a 24 hour fuel station without an attendant and the unspecified diesel was around 1.35 Euro a litre. I gather they don't pay for an annual excise licence on their vehicles.
On motorways and what we might call 'A' road dual carriageways the speed limit is generally 110 kph (120 on certain roads) with signs showing a reduction when it is wet. On typical 'A' roads as we have here it is 90 kph, but this can be reduced to suit certain conditions - like a long downhill run for example - with further reductions if you are a HGV or towing a trailer. Through urban areas the limit drops to 50 kph. The trouble is, us UK drivers are led to believe that the French police are out to catch us at every turn; this is not so. French drivers exceed the limit the same as some of us do and the local police do walk about in town. The signage is very good and speed cameras are well signposted to give advance warning to be careful. Their facilities for stopping to take a break are very good indeed; families pull up and have a picnic and there are very few fast food outlets to poison the population. And most things on sale are made, grown or reared in France (and the butcher still has a lady who takes the cash and doesn't touch the meat). All in all, highly recommended for a glimpse of what the UK used to be like, but they suffer from the effects of the Euro!.
2015 2.2 CDTi SENav 163ps manual 4x4 in Carbon Flash with 19\" alloy spare towing a Bailey Unicorn III Madrid @ 1500kg.