The reduction in fuel tax is getting weaker and weaker with customers.
On Saturday morning, the price for Super E10 rose again, as the ADAC announced on request.
Diesel was roughly at the level of the previous day.
According to the traffic club, both fuels were too expensive.
"There is clearly not enough for the consumer," said a spokesman.
"The development is going in the completely wrong direction."
Specifically, Super E10 cost 1.960 euros per liter on Saturday at 9.50 a.m. according to the ADAC on average nationwide.
That was 1.6 cents more than 24 hours earlier.
Diesel cost 2.001 euros per liter, which corresponds to the value of the previous day.
In view of the development, the ADAC also expected a further increase in the daily average price for E10 for Saturday compared to the previous day.
However, daily average prices are typically lower than the 9.50am values as fuel tends to become cheaper towards the evening.
Prices had already risen on Thursday and Friday.
On a nationwide daily average on Friday, E10 had cost 1.921 euros per liter, diesel 1.969 euros.
E10 was 26.1 cents cheaper than the day before the tax cut, diesel 7.5 cents.
Both are well below the level of the tax cut, which results in a relief of 35.2 cents per liter for E10 and 16.7 cents for diesel.
The Institute of German Economics (IW) in Cologne has determined where the tank discount is popular with consumers in Germany and where it is summarized in an interactive map.
Accordingly, the fuel tax cut in the southwest has little effect.
In Bremen and North Rhine-Westphalia it is above the national average, in Saxony-Anhalt it is in the middle of the national range.