depends on what you like Southwell TBH
Octavia will be more comfortable and better drive on long journeys i would imagine but also should get 35+ mpg out of it ?
i have the same engine as the Fabia in mine and on my way to work which is 40 miles down the M6 everyday i average around 54mpg and thats stuck in traffic also which uses more ? but its a smaller car the the Octavia ? i perfer the bigger car personally which is why i chose the Passat i have at the moment bigger car and more MPG