More polling from the Keystone State suggests Donald Trump may avenge his bitter loss there four years ago.

And the “Trump strength” is even greater than what his numbers show, Trafalgar Group pollster Robert Cahaly tells The Post — possibly enough to flip a Democratic Senate seat.

Against Kamala Harris in the main event, the former president and recent McDonald’s shift worker is cooking up a victory in Pennsylvania just as he fried up a passel of potato strips Sunday in Feasterville-Trevose.

Trump is up 46% to 43% over the Democratic quasi-incumbent, indicating arches aren’t the only things that are golden for the man from Mar-a-Lago in the state, whose 19 electoral votes are better than the prize in any Happy Meal.

Cahaly notes Trump is also winning the crossover vote, saying he “has more strength among registered Ds than she does among registered Rs.”

Five percent of voters don’t know whom they’re backing, and 5% are behind someone else.

But despite that patina of uncertainty, Cahaly contends the race isn’t as close as it may seem, spotlighting how national media framed polls — or a lack thereof — on their Sunday gabfests.

“The mainstream/left leaning polls see it too,” the pollster says regarding his rivals in the survey space and a seeming silence about this critical swing state.

“Isn’t it amazing there was nothing new posted today? Nothing from any of the networks or news channels,” Cahaly comments.

Other polling has shown a closer race in the Keystone State, such as a Massachusetts-Lowell survey that found a 1-point lead for Harris. All told, Trump has a 0.8-point lead on average, per RealClearPolitics.

Even many polls that’ve been favorable to Trump in given states haven’t shown him as able to elevate a Senate candidate. But the Trafalgar survey suggests what Cahaly calls “Trump strength” may be enough to eject legacy Democrat Bob Casey from his Senate seat.

But the margin here is thinner than even a wafer-thin beef sheet on a Philly cheesesteak, with Republican Dave McCormick up 47.2% to 46.8%, with 6% of respondents undecided.

Will those undecided voters split their tickets in the end, embracing a Trump restoration while enabling a Harris lackey to go back to DC and undermine his agenda?

That’s the question the few voters still up for grabs in this all-important blue-wall bellwether will have to answer between now and Nov. 5.