You seem to have an odd perception of the longevity of cars!. The Citroën is a bit tired after 15k miles?, and you feel you need to keep your fingers crossed that your 72k mile focus will keep going?.

In answer to your question keep the focus, as long as you look after it, it will be fine for years to come!

Focus costs £195 a year to tax. Urban MPG is 32.5 - let's assume it will average 35, so it's going to cost £3242 to fuel (@1.25/l) + £195 = £3437 PA.

Dacia Sandero 1.5 Dci can be had pre reg for £0 Tax PA, and 70MPG urban (well, OK maybe not...!). Annual cost is £1660 @ 1.28/l. Makes it 2 grand a year cheaper to run - it will more or less have paid for itself in 3 years, and only have done only 60k miles with warranty, rather than 140k of the Focus without warranty.

I'm pretty sure I'd be looking to change the Focus, although there might be plenty of arguments against not having a Sandero after a Focus!!

I've got a Dacia Stepway, I find it better than the hired Focii I drive occasionally...

Its not as bad as you would think

Customer service is poor, but then Ford is hardly great either

I like the corporate Renault approach, of having a budget brand, using various tricks to keep costs low (same glass size for all cars in the range, using tooling from last generation renaults, etc), although they probably take it a bit too far, especially on right hand drive cars which are nowhere near as good as the left hand drive ones... no space for your left foot due to poor pedal layout, different boot lock, etc

But I dont like the way Renault/Dacia in the UK manage the sales/service or customer relationships, they do take the mickey, they do fail to fix obvious warranty issues, the customer service is so bad that those of use who could afford multiple cars or another car from their more expensive Renault range the next time will be put off.

And the way some things are hidden in the sales process is a bit close to being fraud, listen to the sales patter in the dealerships and the spare wheel is full size, the wheels are alloy, none of which is true, and the sales people dont know much about the cars - not knowing the basic switchgear etc

So I dunno, Dacia need to be bought with open eyes, but still not a definite second place to a second hand Focus

or if you only need the second car occassionally it can work out better to hire a car when the second one is needed. just own one car but flex up. hire cars can be super cheap especially if booked well in advance and being a member of the rental loyalty club.