Fuel mileage

I came across a thread earlier where you guys were comparing MPG's.

My question is this.. How do you guys get such low MPG out of your cars? Like most of you were posting mid 20's, meanwhile I consistently average about 40-45 MPG, 70 mile round trip to work 5 days a week, and fill up once a week. Case in point, right now I've gone 298 miles on 7 gal of gas.

For the record, 2014 LT-T 6mt. I'm not bashing, I'm genuinely curious.