Why Japanese as a matter of interest? At the moment my choice seems to be the self charging hybrid which gets me 50-60 mpg or keep my land rover, which I like, but which gets me a pretty shitty 35 ish mpg. I'm seeing little benefit in swapping for a petrol engine which returns similar
Japanese for legendary reliability, especially in their petrol engined vehicles. I've owned almost nothing but Toyota since I passed my test in 1980. I have never, ever had a repair bill, let alone any kind of breakdown. The only costs have been routine ones. Honda owners will tell similar tales.
I am however nothing like an expert, but if you would like expert opinions and recommendations then head over to the car buying forum on Pistonheads, and start a "What car?" thread. They don't bite, just tell them your situation, budget, requirements etc... and you'll get some very sensible replies. Two posters in particular "ZX10R NIN" and "Georgeboy12345" really know their stuff.
As a side note, 50-60 mpg should be achievable on many modern petrol cars, but if you aren't covering many miles the other costs (such as depreciation) can outweigh fuel costs. Also, the cost of a self-charging hybrid will be more in the first place.
This is a hybrid Toyota Auris:
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Eight years old, 42k miles and £12,000
This is a non-hybrid:
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Half the age, same miles, same price
Non-hybrid 2014 car:
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Same age as the first one, but lower miles and £2k cheaper
In other words, whilst saving a bit of money on fuel is a good thing, it doesn't necessarily make financial sense if you have to spend more in the first place.
Sorry for the long post, Pistonheads will sort you out though :-)