15 Most Fuel Efficient Cars Available on LeaseFetcher in 2018

Unless you carry your wallet around in a helicopter, fuel efficiency is probably high on your list of concerns when you're choosing a new car. However, with petrol, diesel, hybrid, PHEV and fully electric options, it’s difficult to know where to start.

That’s why I’ve rounded up the most fuel-efficient cars on LeaseFetcher across five car fuel types. So have a read and discover your new super fuel-efficient car.

(Fair warning, these figures are the official manufacturer’s numbers which are achieved under the most perfect driving conditions possible. When you have to deal with traffic jams, aggressive drivers and headwinds, your fuel efficiency will be a whole lot lower.)

Most Fuel Efficient Petrol Cars 2018

Making a fuel-efficient petrol car is easy. You build the smallest car possible and fit a tiny petrol engine to it. That’s really all there is to it.

Here are the three most fuel-efficient petrol cars available on LeaseFetcher right now.

  1. Suzuki Celerio — 80 mpg
  2. Fiat 500 — 83.1 mpg
  3. SMART fourtwo — 73 mpg

Most Fuel Efficient Diesel Cars 2018

Diesel engines tend to be more efficient than petrol engines, although that’s partly because there’s more energy in diesel than petrol.

Unlike tiny petrol cars, these diesel cars are a bit bigger and a bit more powerful.

  1. Peugeot 208: 94.2 mpg
  2. Renault Clio: 88 mpg
  3. Vauxhall Astra: 83 mpg

Most Fuel Efficient Hybrid Cars 2018

With basic hybrid cars, it’s a little tricky to measure fuel efficiency because you’ve got a petrol-powered main engine and a secondary electric-powered motor.

  1. Toyota Yaris: 85.6 mpg
  2. Hyundai Ioniq: 83.1 mpg
  3. Toyota Prius: 83.1 mpg

Most Fuel Efficient Plug-in Hybrid Cars 2018

Plug-in hybrid electric vehicles (PHEVs) are a little different from 'normal' hybrid cars. Unlike normal hybrids where the battery is only charged by the petrol engine, PHEVs allow you to plug the car in to the mains and charge the batteries directly.

PHEVs usually have larger batteries and a more prominent electric motor, which allows you to drive for much further using just the electric motor.

Because of the more powerful electric motor and larger batteries, the petrol engine does substantially less work, resulting in much higher fuel efficiency.

Although you're using both petrol and electricity, reviews will usually ignore the cost of the electric motor and just focus on how much petrol you use. For simplicity, this is exactly what I’ve done here but it’s important to remember that there’s an additional cost to the electricity too.

  1. BMW i3 Range Extender: 470.8 mpg
  2. Toyota Prius: 283 mpg
  3. Hyundai Ioniq: 256.8 mpg

Most Fuel Efficient Electric Car

Electric cars obviously don’t use liquid fuels like petrol or diesel so we can’t use miles per gallon as out unit. Instead, I’m going to use a new unit called the miles per gallon gasoline-equivalent (MPGe).

It basically compares the energy consumption of an electric car to the energy consumption of a petrol or diesel car.

The more energy a car uses, the less efficient it is and the lower its MPGe. Simple.

  1. Hyundai Ioniq: 150 MPGe
  2. BMW i3: 137 MPGe
  3. Tesla Model 3: 136 MPGe