With most modern cars, though by all means not every one (as HJ's Real MPG section shows) their 'official mpg' figures should not be believed, so always go, in the first instance, with HJ's real MPG ones.
As Steve says, there are still quite significant variations in the range on that pages for each model, which is due to both driving style and pattern - so many people buy the wrong car - a diesel for short, urban journeys, a gas-guzzling petrol or hybrid for high-mileage motorway driving, so you can reasonably judge what to expect based on this.
The reduction is generally far higher for diesels and especially hybrids, because the now discredited EU tests are highly weighted towards those engine types with how they are tested. When the new WLTP-certificated cars start appearing on the market next month, you'll notice their mpgs (especially plug-in hybrids) will be a lot lower than outgoing models because they (and this test, I think, will be tightened up even more in the next few years) reflect a much more real-world driving experience.
I'd concentrate on looking at models that are:
- Known for their comfort and especially longer term reliability, especially where parts like the DPF are concerned. Spend more on engineering quality rather than styling, equipment and outright performance. Handling just needs to be reasonable as a minimum. Make sure that the seat and driving position/general ergonomic are exactly what you want - you're going to be in that car a LOT - a long (preferably on various road types and more than one test) road test is in order. I've rejected cars before JUST BECAUSE they don't have a left foot rest - I personally must have one (not everyone does, but having one may make more of a difference on your longer journeys);
- Are makes with a long, high mileage warranty, e.g. Kia, Hyundai, a few others and who actually honour them;
- The car has a decent A/C system. I'd go for one with climate control (multi-zone systems are a con [pardon the pun] - I design building A/C systems and you can't expect different temperatures in such a small space, especially as they are aren't sectioned off) as you'll appreciate not having to keep fiddling on the go as the external conditions change;
- The boot is large and accessible enough, similarly room in the back. You'd be surprised (as I've mentioned in anyoner thread) at how often people forget simple things like this, especially if you have/are planning on having soon a family or regularly carry decent sized loads or passengers.
To be honest, you've already 'made your proverbial bed' by accepting a job so far away before looking at the economics of travelling there - I realise that sometimes people (including myself) have to do such things from time to time, and as such, accepting, for a time at least, spending more on fuel may be a decent price to pay in order to get a more reliable, comfortable, less fashionable car that will cost less over its lifetime, until you can afford something 'nicer', or even more home to somewhere the is more accessible which doesn't compromise/affect the rest of your family in similar ways.
I wouldn't be too worried about mpg being X or Y, even if that comes in slightly under an arbitrary figure - unless you can change to another job nearer to home, there's relativaly little you can do in the short term. Whatever car you choose will likely not be worth much when you get rid of it due to its high mileage, so I'd stick to getting the bar minimum spec you need and concentrating on getting a well-engineered car with a good warranty.
The Hyundai i30/i40 Tourer and KIA Ceed/Optima equivalents in diesel form are well worth a look, from a main dealer - and I would prefer to go for ones that have done over 10k miles pa as there's less chance of DPF issues for a higher mileage car. This would also reduce the price a bit, and as long as its been serviced correctly and on time (or per mileage, whichever comes first), then that should be no proble. I'd avoid low mileage examples for their age as they could easily have been shopping cars and thus a DPF problem might appear in the not-too-distant future.
A low mileage example may have (like mine) been used sparingly but for longer trips (better), but unless you personally know the pervious owner(s) or can get a written guarantee from the dealer/manufacturer saying any DPF (or other) problems related to life doing short trips under previous owners will be fixed FOC by them during its warranty and you want ro risk a breakdown, then I'd leave such examples alone. Note that some low mileage examples are also showroom/courtesy/test-drive cars which often are not driven sympathetically, similar to repeated short urban use from cold, which can lead to exhaust/DPF systems clogging up and the battery dying prematurely.
For £15k (with or without PX on you existing car), you should be able to get a decent, reasonably new example of those I've suggested and many others from other Backroomers. If you think you'll be in this 33k miles a year situation for a reasonable number of years, then I'd go for the Hyundai as it has an unlimited miles 5 year warranty, rather than KIA's 7 year but only 100k miles one, which you'd go through in 2-3 years.
Best of luck.
Edited by Engineer Andy on 16/08/2018 at 15:01
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