It really depends on topography and traffic. Here in Switzerland rural highways have a speed limit of 50 mph. There's a town every 3 miles so U can always coast into town. We got lots of roundabouts to coast into plus a lot of gentle hills. My record EOC in a VW GOLF GLI (82 Kw) was 44% !!! My current TDI is much more efficient. Getting 20% with the TDI is already a lot. U get the highest EOC in inner city driving where U actually coast from light to light giving your vehicle enough momentum to 'make it to the next one'.
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