Hydrogen storage is a key enabling technology for the extensive use of H2 as an energy carrier. The European integrated project STORHY aims to develop robust, safe and efficient hydrogen storage systems for automotive applications, among which compressed gas in composite vessels at 70 MPa (700bar). Besides storage development, infrastructure with the development of hydrogen refueling stations is considered and issues linked to compressed technology addressed. The target is to refuel a passenger car in less than 3 minutes. The combination of fast filling and high pressure results in very high temperature increase in the composite vessel, which can damage it. One of the objectives is therefore to reduce overheating and to develop efficient refueling protocols which enable to perform fast and safe fueling of 70MPa storage systems. To that end, filling tests are performed on three different storage systems with the opportunity to benchmark both type III and type IV vessels (metal or polymer liner in a fiber reinforced composite structure, respectively). Thermocouples are integrated between the liner and the composite structure to have a precise evaluation of the temperature increase during the filling tests through the composite wall thickness. Based on these results, optimized filling approaches and protocols are proposed.