Review on 🔌 GISSARAL GISCCA-AM3 90W Laptop Type C Car Charger for 2015-2017 MacBook Pro 13 15 Touch Bar & New MacBook 12; Dual USB Quick Charge for Apple/Android Smartphones & Tablets by Andrew Jenkins

19.9V @ 2.91A is the best I've seen with the car running and the MacBook Pro 15" i7 off (at 50% battery capacity). This corresponds to 57.9 watts. Using the same cable and meter with the MBP drained to 20% and plugged into an 87W Apple charger, I could see peak levels of up to 85W. The closer the laptop gets to a full charge, the fewer watts the battery will use when full. Maybe the charger would work harder if the battery level was below 50%? In a very brief test, the charger and USB adapter generated quite a bit of heat, suggesting energy was wasted as heat. I can not say it. talk about reliability and will be updated over time. Although it is a bit slower than the Apple charger, it successfully charges your 2018 MacBook Pro from a 12V outlet.