You need to change it from states.device_tracker.2015_audi_rs_5.attributes.fuel_level to states.device_tracker['2015_audi_rs_5'].attributes.fuel_level
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You need to change it from states.device_tracker.2015_audi_rs_5.attributes.fuel_level to states.device_tracker['2015_audi_rs_5'].attributes.fuel_level