Fuel Injectors: Carbon clogged injectors cause multiple fuel economy problems. Area 1 fuel tank

Oxygen (O2) Sensors: Soot coating slows sensor response, causing rich air-fuel mixture. Area 1 fuel tank

Intake Valves: Inefficient air intake forces the ECU to compensate with more fuel. Area 3 air intake / exhaust (Gasoline engines only with our iv tube) 

Piston Rings: Blow-by from stuck rings reduces overall efficiency. Area 2 crankcase

EGR Valve: Deposit restrictions disrupt exhaust gas cooling, forcing the engine to run inefficient rich-mixture safety cycles. Area 3 air intake / exhaust (Gasoline engines only with our iv  tube)

VVT Solenoid / Cam Position Solenoid: Oil sludge clogs solenoid screens and passageways, throws off timing. And timing is everything! Clean the Screen! Area 2 crankcase

Cam Phaser: Oil sludge clogs phaser mechanism, stops it from ‘home position’ at shutdown, causes noise at startup, throws off timing. Area 2 crankcase

Exhaust Valves: Heavy deposits prevent proper valve seating, causing thermal efficiency losses through leaking exhaust gases. Area 3 air intake / exhaust (Gasoline engines only with our iv tube)

Catalytic Converter: Partial soot blockages increase engine pumping losses, requiring more fuel to push exhaust gases out. Area 1 fuel tank and 3 air intake / exhaust (for severe blockage) 

DPF: Partial soot blockages increase engine pumping losses, requiring more fuel to push exhaust gases out. Area 1 (to reduce soot output).