Gas mileage is too low - I only can get 350 km on a full tank of gas

Car: Honda, CRV, 2004, 2.4 L - Back to Fix-It - Honda CRV Repair Manuals

Q.Hi! I have a 2004 honda crv, it is run smooth, but one thing I realize that, the mileage of it is too low ( I only can get 350 km for the full tank of gas), I change the A/F sensors, but it is not help at all, the thing is sometimes it reach to 400 or 450 km for a tank of gas, but most of the time it only reach to 350 km for a tank of gas, I wander if you can help me to fix that problem. Thanks...

I already checked/done: changed A/F sensor and secondary HO2S sensor

Answer Ok what you need to do is have a top engine service done.
This is where a chimical is run through the vacuum line of the intake manifold and it clears all o the carbon built up in the motor overthe last almost 6 years.
Once all the carbon is gone you will notice the car runs smoother and the gas mileage has increased. You can get this service done at the dealer for around 150 dollars parts and labor.

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Gas mileage is too low - I only can get 350 km on a full tank of gas