Cars: What is cheaper to run between petrol and diesel?

Current petrol price where I live is 117.9p per litre Current diesel price where I live is 129.9p per litre Based on these figures - what would you rather have? 1. A petrol car that returned 40mpg 2. A diesel car that returned 70mpg 10 points await the person who can be bothered to show me some... show more Current petrol price where I live is 117.9p per litre
Current diesel price where I live is 129.9p per litre

Based on these figures - what would you rather have?

1. A petrol car that returned 40mpg
2. A diesel car that returned 70mpg

10 points await the person who can be bothered to show me some calculations.

Many thanks
13 answers 13