half true. cruise control is most efficent when on longer trips as it will maintain a constant speed with less large changes in acceleration and a large ammount of small changes. however the best way to maintain fuel economy is not so much in the art of driving on flat roads and maintaining constant speeds which help but to try and slow and stop less or slow down less as it takes more fuel to accelerate again or to start from a stop so if you can give distance in between to not stop and keep a roll or to accelerate slower you will find you can maintain a better overall fuel economy.
currently my car is at 435 km and just went 1 bar below half. im projecting to get 750 km to this tank or more.. imagine if i had a skyactive
vehicle info:
75W90 motul trans fluid,
0W20 Synth Oil,
AEM Cold Air Intake
current average fuel econ - 8.0 L / 100 KM
Last 4 tanks were 7.7L / 100 KM
All time Best 6.9L / 100 KM
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