The Andretti driver had climbed from 10th on the grid to challenge for victory and led at several points during the 34-lap contest in Brazil on Saturday.
The Briton found himself back in third after taking both Attack Mode activations, admitting that “communication wasn’t great” between himself and the team to capitalise on the strategic element.
“I think the win was there,” Dennis told Autosport. “That second Attack Mode was quite unclear from my side.
“I got told to take it when we still had attack, [mode] so it would have been a failure of Attack Mode, then I got a late call to cancel it and then I took it again. It was all a bit of a mess.
“It just wasn’t very clinical between me and the team, the communication wasn’t great.
“We move on and we learn from it and I think we’ll be better prepared if we’re in that situation again.”
Source: Autosport