Outdone by Mercedes at the start of this season, Christian Horner fears Red Bull are paying for Renault's late start to the new V6 era.
This season has been all about Mercedes and Mercedes power while Red Bull's Renault engine have struggled with reliability and power.
The Renault-powered teams all had a torrid pre-season, spending a great deal of it on the sidelines due to engine and cooling issues.
Once on track in Australia, the situation did improve and has steadily since, however, Renault are still lagging some way behind Mercedes.
And Horner believes that is due to the French manufacturer making a late start in the development of their 1.6-litre V6 engine.
"It's quite simple...
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