I have a Volkswagen Passat B8 Variant car with 1.6 TDI 120hp diesel engine car from 2016. Manual transmission. Diesel and gasoline prices are at record highs currently in my country of Austria in Europe (2 EUR per liter of diesel which translates to roughly 9 USD per gallon, the "normal" price is usually around 1.0 to 1.2 EUR per liter) so I have been looking for way to save on fuel while driving.
I noticed the following
- My diesel engine does not turn off if I simply put in any gear and let it drive without pressing gas pedal even once; the car moves as it should without a single push on the gas pedal, even if I stand still and want to start moving it in first gear
- If I do that in the highest gear (6th gear), I reach a speed of around 60 km/h (37 mph) which is exactly the max. speed limit in my hometown on main roads coincidentally
- Unsurprisingly, the engine is using far less diesel when driving like that - I can bring down my average consumption down to 3.8 l/100km (61.9 mpg)
- When driving at any gear without pressing gas pedal the engine is a little bit louder compared to driving while pressing the gas pedal a little bit but the difference in noise is not that much; also no warning indicator or anything lights up - in general there seem to be no issue that is obvious to me
My question is - does driving like that damage the engine or maybe the transmission or anything? Is it recommended to drive like that as long as the sound does not bother me?