How to Solve the High Fuel Consumption of the Eighth-Generation Civic?

[AdamMarie]

The solutions to high fuel consumption in the eighth-generation Civic are: 1. Clean the engine carbon deposits; 2. Check the oxygen sensor; 3. Regularly replace the three filters and inspect the electronic control unit. The body dimensions of the eighth-generation Civic are: length 4517 mm, width 1799 mm, height 1434 mm, wheelbase 2700 mm, minimum ground clearance 104 mm, and fuel tank capacity 47 liters. The eighth-generation Civic is equipped with a 1.5T turbocharged engine, with a maximum power of 130 kW and a maximum torque of 220 N·m, paired with a CVT continuously variable transmission. It features a front suspension type of MacPherson independent suspension and a rear suspension type of double-wishbone independent suspension.

[VonAlice]

I've also experienced high fuel consumption with the 8th-gen Civic, and the key is to focus on driving habits and basic maintenance. I usually avoid sudden acceleration and hard braking, anticipate traffic lights in the city by easing off the throttle early, and maintain a speed of 80 to 100 km/h on highways for optimal fuel efficiency. I check tire pressure weekly—2.3 in summer and 2.5 in winter is ideal—and replace tires immediately if they show significant wear. I change full synthetic oil every 5,000 km, replace the air filter at every service, and swap out spark plugs at 80,000 km. To tackle carbon buildup, I regularly use fuel additives and run the engine at high RPMs on the highway. Keeping the trunk free of unnecessary items and tracking mileage and fuel consumption at each fill-up are small details that matter. Sticking to these practices for two months can reduce fuel consumption by about 1 liter.

[DeKeira]

My eighth-generation Civic has been in use for seven years, and addressing fuel consumption issues requires both hardware and software solutions. On the hardware side, focus on four key areas: A failing oxygen sensor can affect fuel injection values—after replacing mine at 120,000 km, fuel consumption dropped from 9L/100km to 8L/100km. Check if the fuel injectors are clogged; cleaning them costs around 200 RMB but delivers noticeable results. Leaky ignition coils lead to incomplete combustion—replacing the entire ignition system costs only 800 RMB. Perform a wheel alignment if tires show uneven wear, and repair any abnormal bearing noises. On the software side, cultivate good habits: Avoid keeping sport mode constantly on, set the AC temperature 1 degree higher to reduce compressor load, and shift to neutral during traffic jams instead of idling for too long. Don’t underestimate these small adjustments—they save real money.

[McEli]

To solve high fuel consumption, focus on key points. First, measure actual fuel usage: fill up the tank, drive 200 km, refuel and divide by mileage—don’t rely solely on the dashboard display. Prioritize checking wear-prone parts: older Civic spark plugs degrade by 50,000 km—replace with iridium ones for smoother starts and better efficiency; a dirty air filter raises consumption by 0.5 L/100 km after three months; switch to 0W-20 low-viscosity oil for savings; inspect the EVAP purge solenoid to prevent fuel vapor leaks. For driving, shift manuals at 2,000 RPM and ease throttle pressure in automatics to avoid downshifting. Refueling at night reduces vapor loss and ensures better fuel quality. These practical tips can easily save $100 monthly on fuel.