Which route uses the most fuel?

-Car: Peugeot 206 Diesel.



Route 1 is 13.2 miles, usually takes 45-60 minutes in stop start traffic through Birmingham from Quinton to Solihull.



Route 2 is 27.2 miles, usually takes 35 mins on the M42 again from Quinton to Solihull.



My question is, which one will use more Diesel - obviously the motorway route is twice as far, but as I'm constantly moving at a good speed does this mean I'll be using less/same/more fuel than spending more time in the car moving between gears stopping and starting.



Time wise the motorway is quicker and less stressful but if it works out a lot more expensive in fuel then maybe I will pick and choose depending on how much of a rush I am in to get home!



If anyone could shed some light on this it would be a huge help.



Thank you.Route 1 will use more fuel.