Elemental analysis (CHN) was performed according to the EN15407:2011 standard [19]. Sulphur and chlorine determinations were performed according to the EN 15408:2011 standard [20]. Oxygen content was calculated by difference. These analyses were performed by Bränslelaboratoriet Umeå AB. Energy content was determined using a LECO AC-350 bomb calorimeter on 0.5 g of dry sample. Proximate analysis was carried out in a STA 6000 Perkin Elmer Thermobalance using 5–15 mg of sample and 70 mL min−1 gas flow [21]. The decomposition of the fuels under pyrolytic conditions with Fourier transform infrared spectroscopy (TG-FTIR) was performed using a thermogravimetric analysis coupled Netzsch STA 409 at a heating rate of 10 °C min−1, with typically 30 mg sample under flowing N2 at 100 mL min−1, coupled with a Bruker EQUINOX-55 instrument equipped with a liquid N2 cooled MCT detector.