The Americana Diner is on Route 35, in Shrewsbury, I have some recollection that the Eatontown diner Notjr prefers is the All Seasons, which is in Eatontown. Their sister diner, All Seasons II, is on Route 9 North, in Freehold.
I generally steer clear of diners since I have found the food in most to be even less than mediocre. However, in January of 2014, we came back late from NYC to discover that the heat had gone out in our house. Our heating company couldn’t come until early in the morning, so we booked a motel next door to which is the All Seasons II. We were starving, and considering the hour, it made sense to eat there. We’d not been there since the current owners took over. So, I was pleasantly surprised that the food we had was good. While the onion soup was merely decent, the cheeseburger with onion rings were perfectly prepared and delicious. We also ate breakfast there. Shared a very satisfying platter of good quality smoked salmon, Philly cream cheese, and a bagel + tomato, lettuce, onion, and kalamata olives. You can see photos of both meals here and here.