New with a 2000 Sunfire
 

Just joined and have a 2000 Sunfire. Want to get the fuel economy up as currently it is under 30 MPG. I have changed oil (non synthetic, as i have a small leak), Tires are at max pressure, and recently had the subframe, fuel filler tube, LR strut, and muffler replaced. (Now have a high piched whine at 3000rpm since muffler change).

What suggestions does one have to help with increasing the MPG?

Welcome. Is you mileage lower than it used to be? If you're just looking for tips on driving style click here.

I bought the car ~2 months ago. I used to own a 98 sunfire that sipped the gas, but this one seems to inhale it. I also owned a 09 cobalt that did better on gas than this sunfire.

The 98 was a 2 door with no AC and a 5 speed, and no options

The 00 is a 4 door with AC and a 4 speed auto with most options.

I know the Manual makes a difference, but i wouldn't think it would be that huge.

Welcome to the site. Auto or manual transmission? The auto is hard to get good mileage in, I had an automatic 97 Sunfire that I struggled to top much more than 30 mpg in during summer, in winter no way.

Auto 4 speed.

I am reading your thread now about your '97 Sunfire.

I filled up today. 12.14 gal on 301.6 miles. Averaging 24.8 MPG.

Want to get the car to 30 MPG.

The main key with mine was getting the torque converter to lock up. For me, that meant I had to be going 45 mph or higher. Below that mileage was horrible.

My commute is ~15 miles one way with the speed limit between 55 and 65 mph.

24.8 mpg is not much worse then the cobalt was at ~27.