Three fuel efficiency factors
Small is beautifulBuy the smallest car that suits your needs – that goes for engine size and its actual dimensions. Just being lighter means it needs less fuel to get moving. It’ll likely cost less to insure as well – use the savings to hire a bigger vehicle if you need it now and then.
AgeEvery year, manufacturers get better at optimising fuel efficiency in the vehicles they make (responding to demand from people like you). They improve engine efficiency and tweak the aerodynamics – and keep making them safer too. So in general older vehicles cost more to run and produce more emissions than newer models.
Maintenance historyThe less a previous owner spent on their vehicle, the more it’s likely to cost you. A poorly-maintained car can use 10-20% more fuel than a well-maintained one – producing more emissions as it goes. So choose a vehicle with a documented service history or get it checked over by a good mechanic before you buy.