It's really hard to ecomod the Lupo 3L, because so much has been done from the factory. You can get some inspiration from Vekke's thread about his modifications to make a 3L lupo in to a super car.
He copped and lowered the roofline in the back and added a kamback.
Kamback will help a lot. Also get them tires up to around 2.8 - 3 bar in pressure if you can tolerate to drive with that.
I think you've got to stay in the inner lane with the trucks if you want to get to 77 mpg. Calculate how much more time it will take to go to work then. I can be much more .
You got 90 km to work. Staying withthe trucks the trip shold take one hour. Going 130 km/t in the fast lane will only get you there about 10 - 15 minutes quicker. Is that worth it?
If you tailgate one of the trucks most of the way you could bring the Lupe til 100 mpg. Not that I recomend tailgaiting anything at all..... But....
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