TDI and short driving distances? Follow??

Hello everyone, I have a little concern. I found a new job from January 2007 and therefore do not have to drive so many kilometers. So far I drove almost 90 km every day (Hin-& return trip) and almost only motorway. I was completely satisfied with the consumption of my G4 TDI (approx. 5.2-5.8 l) depending on the way of driving. From January I only have about 24 km (Hin-& return trip). I have a slight fear that this is not necessarily so good for my TDI (because of increased driving time). Wear, not getting really warm, higher consumption etc. ….) Do you have experience with short distances and diesel vehicles. Are there any things I should consider? Thanks already for your comments. Greetings from gtivr6