Poor Fuel Consumption

[TUIKAN]

Hello from finland, I have lexus is220d. The car is about three years old. I wondering the big fuel consumption.

The average consumption is 32mpg ( in suburban ) and in highway 38mpg, I think this values is 25% higher as

manufacturer data! ( and believe me, I have tried to drive very very smoothly )

I have noticed strange behaviour on CURRENT FUEL COMP. METER, for example: when I drive at speed 40mph in

flat road and follow the meter. it shows about 45mpg, but suddenly it jump up to 25-30mpg and stay about 2sec.

then it goes down 45mpg and after 5-20 second it repeat this. The same effect is also in highway

This have not effect for speed of car. I think this could be reason for increased fuel consumption?

I make note to service at year ago, they up-dated ECU and changed 5 injector. but this not help.

So help me, have someone get help for same kind of problem ? some sensor ?

Br.

Tuikan

[dgman]

Hello from finland, I have lexus is220d. The car is about three years old. I wondering the big fuel consumption.

The average consumption is 32mpg ( in suburban ) and in highway 38mpg, I think this values is 25% higher as

manufacturer data! ( and believe me, I have tried to drive very very smoothly )

I have noticed strange behaviour on CURRENT FUEL COMP. METER, for example: when I drive at speed 40mph in

flat road and follow the meter. it shows about 45mpg, but suddenly it jump up to 25-30mpg and stay about 2sec.

then it goes down 45mpg and after 5-20 second it repeat this. The same effect is also in highway

This have not effect for speed of car. I think this could be reason for increased fuel consumption?

I make note to service at year ago, they up-dated ECU and changed 5 injector. but this not help.

So help me, have someone get help for same kind of problem ? some sensor ?

Br.

Tuikan

take it back to your dealer and ask them to check that the fuel injectors are performing correctly,there have been some reports of faulty injectors.