Haug, who had a long involvement in the DTM via his role at Mercedes, is concerned about the budgets required to run a team in the series and feels in-season testing is having a detrimental impact on the quality of racing.
“The DTM is still far too expensive," he told Bild. "There is far too much testing. That's a sustainability issue! You can't keep burning tyres and fuel senselessly in the future.
"I would abolish testing altogether, at most allow it on the simulator. Formula 1 doesn't test at all and the DTM does unlimited testing. So that can't be the right formula.
“Without testing, the races will be better and more exciting. There are more moments of surprise, the drivers are more decisive and more in the spotlight."
Source: Autosport