1991 Porsche 911 Carrera 4/2
Fuel Economy Overview
The 1991 Porsche 911 Carrera 4/2 achieves an EPA-estimated 16 MPG in combined city and highway driving, with 14 MPG in the city and 21 MPG on the highway. Powered by a 3.6L 6-cylinder engine paired with a manual 5-spd, this minicompact cars features 4-Wheel or All-Wheel Drive drive.
In terms of environmental impact, the 1991 911 Carrera 4/2 produces approximately 555 grams of CO2 per mile. This figure is measured under standardized EPA test conditions and represents tailpipe emissions only. For context, the average new vehicle sold in the United States produces approximately 400 grams of CO2 per mile, meaning this 911 Carrera 4/2 has higher-than-average emissions in this regard.
The estimated annual fuel cost for this vehicle is $4,300, based on 15,000 miles of driving per year and current national average fuel prices. Compared to the average new vehicle, you would save $10,750 over a 5-year period. This calculation accounts for differences in fuel consumption efficiency and provides a practical measure of long-term ownership costs attributable to fuel economy.
Energy DNA
Green Scorecard
Personalized Commute CalculatorEPA defaults to 55% City / 45% Hwy
Adjust the slider to match your daily driving habits. City driving involves stop-and-go traffic under 45mph, while highway driving represents sustained speeds over 55mph.
Aerodynamic Speed Penalty
EPA highway tests average roughly 48 mph. Driving at 75 mph increases aerodynamic drag exponentially. Expect your real-world highway fuel economy to drop by roughly 15-20% at interstate speeds.
5-Year Total Cost of Ownership
Recall Intelligence
A PART OF THE STEERING COLUMN UPPER UNIVERSAL JOINT CRACKED DURING THE MANUFACTURING PROCESS.
Consequence & Remedy
Consequence: THIS CONDITION COULD RESULT IN NOISE AND FREE PLAY IN THE STEERING SYSTEM AND IF LEFT UNCORRECTED, WILL RESULT IN LOSS OF STEERING CONTROL.
Remedy: DEALERS WILL INSPECT THE UNIVERSAL JOINT FOR CRACKS AND WILL REPLACE CRACKED JOINTS WITH NEW PARTS.
THE HYDRAULIC BRAKE PRESSURE REDUCTION VALVE CAUSES THE RATE OF HYDRAULIC PRESSURE REDUCTION TO SLOW DOWN, WHICH MAY RESULT IN THE REAR WHEELS LOCKING-UP EVEN WITH THE ANTI-LOCK BRAKE SYSTEM IN OPERATION.
Consequence & Remedy
Consequence: REAR WHEEL LOCK-UP MAY RESULT IN LOSS OF VEHICLECONTROL AND AN ACCIDENT.
Remedy: PORSCHE DEALERS WILL INSTALL A MODIFIED HYDRAULIC BRAKE PRESSURE REDUCTION VALVE.
AFTER THE ENGINE HAS BEEN TURNED OFF, THE REAR HEATER WILL AUTOMATICALLY OPERATE IN ORDER TO DISSIPATE HEAT IN THE ENGINE HEATING SYSTEM. DURING THIS OPERATION, THE RESISTOR FOR THE REAR HEATER BLOWER CAN BECOME OVERLOADED DUE TO A BINDING OR SEIZED REAR HEATER BLOWER.
Consequence & Remedy
Consequence: THE OVERLOADED RESISTOR CAN CREATE HEAT SUFFICIENT TOIGNITE THE PLASTIC AIR PIPE TO WHICH IT IS CONNECTED, RESULTING IN AN ENGINECOMPARTMENT FIRE.
Remedy: PORSCHE DEALERS WILL INSTALL A NEW RESISTOR CONTAINING A CIRCUIT BREAKER.
THE BALL SOCKETS ON THE CRUISE CONTROL LINKAGE CAN BREAK, ALLOWING THE CRUISE CONTROL LINKAGE TO BECOME DETACHED ON ONE END AND JAM ON NEARBY COMPONENTS, WHICH COULD IMPAIR THROTTLE PLATE OPERATION.
Consequence & Remedy
Consequence: IMPAIRED THROTTLE PLATE OPERATION COULD PREVENT THEENGINE FROM RETURNING TO IDLE, RESULTING IN UNWANTED ENGINE SPEED AND POSSIBLEVEHICLE ACCIDENT.
Remedy: REPLACE THE CURRENT PLASTIC BALL SOCKETS WITH A NEW LINKAGE USING STEEL BALL SOCKETS, AND LUBRICATE THE CRUISE CONTROL RELAY LEVER. OWNERS ARE ADVISED NOT TO USE THE CRUISE CONTROL UNTIL THE MODIFICATION IS INSTALLED.
Loading live complaint data...
Looking for comprehensive historical data?
NHTSA FARS (Fatal Crash History) and broader generational safety trends are aggregated at the model level rather than by specific engine configurations. View the complete historical data profile for all Porsche 911 Carrera 4/2 configurations.
Similar 1991 Minicompact Cars Alternatives
1991 Porsche 911 Carrera 4/2
3.6L 6-cyl Rear-Wheel Drive
1991 Porsche 911 Carrera 4/2
3.6L 6-cyl Rear-Wheel Drive
1991 Porsche 928 S4
5L 8-cyl Rear-Wheel Drive
1991 Wallace Environmental Wetl 300 SL
2.9L 6-cyl Rear-Wheel Drive
1991 Porsche 911 Turbo
3.3L 6-cyl Rear-Wheel Drive
1991 Porsche 928 S4
5L 8-cyl Rear-Wheel Drive
Fuel Cost Analysis
Based on 15,000 miles/year and current fuel prices.
Efficiency Breakdown
Estimated Lifetime Carbon Footprint
(Based on 200,000 miles driven)