I observed that my Camry 2010 has poor fuel economy. When scanned it was observed that fuel efficiency is fine while in motion but very poor at stationery.
The exhaust line has been checked and panel says no leak.
The exhaust tail is clear, no black.
What could be the course of the poor fuel economy.

A heavy right foot

legionISproteus:
A heavy right foot

Abi he may be aggressive in revving

Maybe the smart fuel Guage is confusing you.

Guage drops faster while the car is stationary because of very low miles per gallon. When the car is set in motion, you will notice that the Guage will rise or drop more slowly.

Your concern might be real though.

EngRichie:
Maybe the smart fuel Guage is confusing you.

Guage drops faster while the car is stationary because of very low miles per gallon. When the car is set in motion, you will notice that the Guage will rise or drop more slowly.

Your concern might be real though.

I don't think so. Scan confirmed that the car takes more fuel at idle. It was scanned at idle and in motion .

legionISproteus:
A heavy right foot

Heavy right foot at idle?

adesanyadotun:

I don't think so. Scan confirmed that the car takes more fuel at idle. It was scanned at idle and in motion .

Can you provide scan data to buttress this?

Higher fuel consumption at idle compared to when the vehicle is in motion is usually a factor of the presence of a vacuum leak.
Because at idle the unmetered air makes the ECU/PCM spray more fuel to compensate for extra air. However when in motion the extra air getting in is negligible since the amount of air intake is more and might be closer to atmospheric pressure.
Reverse is the case if the MAF was dirty.
So OP kindly check for vacuum leaks among other things...

AutoMoTech:

Can you provide scan data to buttress this?

Higher fuel consumption at idle compared to when the vehicle is in motion is usually a factor of the presence of a vacuum leak.
Because at idle the unmetered air makes the ECU/PCM spray more fuel to compensate for extra air. However when in motion the extra air getting in is negligible since the amount of air intake is more and might be closer to atmospheric pressure.
Reverse is the case if the MAF was dirty.
So OP kindly check for vacuum leaks among other things...

A Vacuum leak will throw a P0442/P0456 code and trigger the Check Engine Light.

Itulah:



A Vacuum leak will throw a P0442/P0456 code and trigger the Check Engine Light.

Sorry not always.
Not all vacuum leaks throw codes. Some will cause an ignition misfire, some will cause a rough idle etc. If you follow error codes, you will keep fixing stuffs that aren't broken. Don't be deceived. Not all vacuum leaks throw codes.
For the codes you dropped;
P0442 Evaporative Emission Control System Leak Detected (small leak) - this is a leak in the emissions system. The only way this will cause higher fuel consumption is if the purge valve is stuck open thereby allowing fuel vapour directly into the engine. This will result in negative fuel trim figures.

adesanyadotun:
I observed that my Camry 2010 has poor fuel economy. When scanned it was observed that fuel efficiency is fine while in motion but very poor at stationery.
The exhaust line has been checked and panel says no leak.
The exhaust tail is clear, no black.
What could be the course of the poor fuel economy.

please show us the results from you scan


especially the poor fuel economy at idle aka stationery

Let's see the scan result that shows higher fuel consumption at idle for further analysis. You might just mention the error code.

adesanyadotun:

I don't think so. Scan confirmed that the car takes more fuel at idle. It was scanned at idle and in motion .

OK, I will try whether I can retrieve the scan result.
No check engine light though, my auto tech suspected vacuum leak.
Scan did not bring up any trouble code.
The fault was detected checking the life data of the car.