As a point of comparison I have a Renault Twingo, the previous model as the one shown in the article, bought it second or third hand in 2004, the entire car for

As a point of comparison I have a Renault Twingo, the previous model as the one shown in the article, bought it second or third hand in 2004, the entire car for less than 5000€, so less than the modification here, and it's still working well. Autonomy is about 500 Km (very small tank) but you never use this for long journeys, so the 100 Km after electrification would not be an issue. The issue on my car is that there are points of rust in some places and there is a new law that may disqualify my working car from being road worthy the next time I go to the mandatory check. (gotta encourage car turn over for the economy). If this modification could fix my rust issue (I think it's on the underside of the exhaust pipe so not needed anymore) I could be interested.