Hi please can you help me? I'm aware with an old car like this, my mpg will be significantly lower, however on recent calculations, it looks like I'm getting around 16mpg. I'm weighing up buying a new car for a few reasons, one of them being as my fuel costs are around £200 a month. My logic is that if I get a car that has 30mpg or more would roughly double my fuel economy. Is this right? Example - I've seen a 3series BMW 2005 plate that honestjohn says would get 31-68mpg. Based on these figures, I'm thinking at worst I should at least double my fuel economy, so it would be £100 per month instead of £200. Have I got this right?