Does cleaning the throttle body help mileage?

[SRSW]

A few points mentioned above - I've oil flushed a Renault Megane 1.5dci (eco beast!) and it really knackered the engine before, I am sure it was the flush that did it - never seemed right after, all to the 'Wynn's Diesel Enginer Oil Flush' instructions too.

My first car was a Fiat Cinquecento - such a funny first car. I cleaned the TB on that and it made some performance improvement, but I was having issues with hesitation when pulling away and it was just a common issue with it getting gummed up. Many moons ago now though.

[hotwheel]

Yup, as long as you don't let it get clogged up, there's no need for cleaning. Doesn't do anything to your mileage

[Grant-53]

I had the same model and didn't have an issue with the throttle body. Anything that is clean and properly lubricated works better.

[LeanBurn]

As hypermiling is all about how little you can open the throttle body (less the TB is open, the less fuel is consumed.) a TB that is closed 95% with even a 1mm layer of film on it would have no bearing on fuel economy as it doesn't add to the restriction of the overall intake mass air. Its using a straw to breath in with then sticking the straw into a large cup vs xlarge cup, the amount of air volume being taken into the straw is the same.

Effect on performance, throttle response and correct operation....for sure.