^^^ You can't just increase the figures by 40% as they aren't just petrol costs.
Personally I have two cars, an old Mini Cooper that gets used twice a month if it's lucky, and a diesel VW Golf Plus as the family car. Even though diesel costs far more than LPG now it's still cheaper to run that the equivalent petrol version. It still costs almost £70 to fill it though, although that'll be good for 650 miles.
^^^ You can't just increase the figures by 40% as they aren't just petrol costs.
Personally I have two cars, an old Mini Cooper that gets used twice a month if it's lucky, and a diesel VW Golf Plus as the family car. Even though diesel costs far more than LPG now it's still cheaper to run that the equivalent petrol version. It still costs almost £70 to fill it though, although that'll be good for 650 miles.