RAV4 2008 fuel economy

[dilog]

I bought a RAV4 Cross Sport 4x4 2L 4 months ago (90000km or 55600miles), in very good condition and the first 2 months the fuel consumption was about the expected, 7.6lt on motorway and 8.2-8.6 city driving. Now I left the car to a garage for 90000km service (equivalent to 60000miles) and after that the consumption increased significantly, approximately to 9.6-10.2 average value. They only changed spark plugs, oil and oil filter as well as air filter. 

What is wrong? Is it possible they may have me cheated? How? Where should I look? 

[Corolla2004]

Don't know where you're located but lower winter outdoor temperatures will cause increased fuel consumption. A thicker oil grade won't help but I wouldn't have thought it make a big difference. Worth checking your tyre pressures as well as looking for binding brakes by touching your wheels after a run.

[dilog]

many thanks, I'll look for the brakes but its a mystery all happened after visiting the garage. Its not that cold i Stockholm, Sweden now, about 14 degrees Celsious.

[IanML]

Visiting the garage could be a coincidence.  I zeroise my consumption indicator after every fuel fill-up, and the reading has gone from 25mpg to 21 after the last fill.  The temp has gone from about 19C to 14C recently.  Nothing done to the car.

[dilog]

You mean from 21 to 25?

[Steve Earwig]

He's quoting mile per gallon, the bigger the number the better, while you're using l/100km, the smaller the number the better.

25l/100km?🤨 The car would need shooting...

I'm seeing an appalling 11 l/100km on my automatic just now, which is probably due to colder weather and lots of tiny little journeys because covid.

 

[IanML]

2 hours ago, Steve Earwig said:

He's quoting mile per gallon, the bigger the number the better,

Just so 😎