The launch of the BMW i3 has created a huge buzz. The new electric car was unveiled in London in the summer and we gave readers the chance to view the car immediately afterwards.
Electric cars aren't for everyone, but we all love a car with running costs that won't leave the bank account in tatters, so we've dipped into our classifieds to pick a selection of fuel-efficient cars.
All the cars below achieved more than 55mpg in our own True MPG tests:
Audi A4 Avant 2.0 TDI (163) SE Technik
Not a car that you would expect to appear on a list of economical cars, but this estate achieved 59.3mpg when tested by our True MPG team. This is a '13/62 car that has done 6800 miles. This great example can be yours for £24,990.
Honda Civic 1.6 i-DTEC SE
This Honda Civic is only a year old and has 10,000 miles on the clock. It has a decent specification that includes climate control and alloy wheels. It's being sold for £14,995. Our True MPG team tested the Civic and were able to get 66.4mpg - an impressive figure for this practical hatchback.
Hyundai i20 1.1 CRDi Active 5dr
The i20 with the 1.1-litre diesel engine returned 61.1mpg in our True MPG tests. This model is on a 13-plate and has done just 10 miles. It'll cost you £12,895 new, but you can pick up this model for just £9988. That's a saving of nearly £3000.
Kia Rio 1.1 CRDi 1 Air Ecodynamics 5dr
The Kia Rio is one of the best performing cars in our tests, with this model returning 70.6mpg. This is a 2012 car on a 61-plate that has 13,000 miles on the clock. It's up for £10,000.
Mercedes-Benz A200 CDI Blue Efficiency
This nearly new A200 CDI is on sale for £21,995. That's a saving of £1500 on list price. For that you get a premium hatchback that achieved 58.6mpg during our True MPG road test.
Visit our Approved Used Cars finder to uncover hundreds of other choices from Trusted Dealers.