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1. topic is addressed in other threads.
2. 'all modern engines??????? 1984 and up? 1999 and up?
3. Majority of posters here have 'older' cars.
4. the issue of engine on/ neutral coasting has been determined to be manufacturer specific. Alos addressed in other threads.
for example, the last year of the ford taurus (mayby older ones also) DOES NOT gain any advantages. the rpms DO NOT drop
My 02 (02-06) Infiniti Q45 DOES benefit from engine on/ nuetral coasting DOES make a difference.
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