Do You Really Need Fuel Additives on Todays Cars

Why does my Lexus have no overdrive? What's the squeak in my Tacoma front end? Using fuel additives or not? 11 F150 slipping 4x4 hubs Transmission fluid change or not? 09 Rav 4 Why does my carburetor lose prime overnight? 82 Ford F700 95 G20 Chevy Van misfire on highway only 75 Caprice could it be cam failure? Cold start only mis 10 Silverado 13 Titan should I do coils and plugs? 06 Jeep Commander ac won't work at idle 97 Mustang flashing OD light Acura MDX warning light