I don't think I can put a percentage for the categories. I am driving a quite old diesel car (Opel Astra G 2.0 DTI) and my motivation for ecomodding comes from some deficient design due to cost reduction. I am not happy with the geometry of the front bumper (without fog lights) that for sure creates additional drag. My monthly medium fuel consumption considering 50% on highway (130 km/h and +) and 50% city and national roads is around 6l/100km ( 39.2 mpg ). Sure I would like to drop the consumption with 15%. I like also to have a customized car, but I will not add "bling" that will reduce the performance of the car.
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