Journeys - I'm lucky in that I don't have much start-stop urban driving.
I've looked at the overall fuel use on my commute, rather than mpg, and best choice of routes is a twisty B-road that is the shortest route, and includes a small town. Better even than steady 60mph on motorway over a much longer distance.
Just upgraded my grille block from coroplast to black foam-in-the-grille-gaps