Petrol or diesel; which should I choose? Part 1

With the constant increase in fuel prices making more of a dent in your wallet it is ever more important to make sure that you are driving a car that is as economical as possible. There is a common school of thought that dictates that the default choice for those that want an economical car is to buy a diesel.

With manufacturers putting increased focus on the economy and efficiency of their petrol engines though the choice between petrol and diesel may become far harder in future. In this blog we thought we would compare two equivalent models of the same car, one with a petrol engine and the other with a diesel engine over several different factors.

The car we have chosen for this comparison is one of the best selling cars in the UK, Ford’s sixth generation Focus.

Purchase price


  • Petrol

As we wanted to compare two models we have chosen the 1.0 litre ecoboost petrol engine as it is the most closely comparable spec for spec with Ford’s Diesel. The initial purchase price of this 3 cylinder city car with stop/start technology starts at £14,845.

  • Diesel

Ford’s comparable 1.6 litre TDCI diesel engine with roughly similar power and specs starts at £16,945.


With a saving over the diesel of £2100 the petrol comes out well ahead on initial price and it certainly seems that petrol has a head start over diesel in this crucial stage.



  • Petrol

Despite its diminutive size Ford’s 3 cylinder petrol engine really packs a punch, with 99 horsepower on tap the petrol engine goes from 0-62mph in 11.2 seconds and on to a top speed of 112 mph.

  • Diesel

Ford’s 1.6 litre diesel engine gives away 5 horsepower to the petrol with 94 and the 0-62mph is 0.5 seconds slower also. The top speed of the diesel is the exact same 112mph.


Another clear win for the petrol engine here, we may well see a fair few diesel devotees convert to a petrol car in the near future.

One issue that worries many drivers when changing the fuel that they use in their car is putting diesel in a petrol car or vice versa for example but here at Wrong Fuel we are always here just in case this was to happen.

Stay tuned to our blog in the next week for part two in which we move on to the key factors of long term fuel economy and service costs to decide a final winner between these two types of fuel.