How far would a full tank of gas go averaging 75 mph until the low gas light signal appears, (90% flat road, 10% incline , 4 full size adults w/ luggage +550 pounds)? I know this gets technical when you consider every factor that affects mileage but I'm just looking for responses based on actual experience and fairly good estimates

Looking for feedbacks towards a 4.4i. Feedback on other engine displacements is welcomed as well. Thanks