Why the high fuel consumption when everything that I could change has been changed and the engine still seems a bit rough at idle or stopped in drive

Finally figured it out thanks to the web. For other optra owners, the fix will cost you $5.00 for a can of carb cleaner. Locate your MAF (air volume) located in the hose going to your fuel injectors, looks like a funny T. Next disconnect bit, spray the sensor and let dry. Works wonders. Thanks to other Chevrolet owners

2253, 3116, 3451, 2152, 4362, 4316
4316, 4513, 4362, 1156, 2145, 1156
6451, 6361, 5624, 5241, 3346, 1165
3241, 4524, 5436, 5813, 3265, 5624
2453, 3462, 3251, 5445, 8253, 1156
2346, 4853, 6645, 5253, 1325, 4136
3116, 3221, 2151, 5312, 2654, 4314
6234, 4356, 1415, 1435, 1156
2253, 3116, 3451, 2152, 4362, 4316
4316, 4513, 4362, 1156, 2145, 1156
6451, 6361, 5624, 5241, 3346, 1165
3241, 4524, 5436, 5813, 3265, 5624
2453, 3462, 3251, 5445, 8253, 1156
2346, 4853, 6645, 5253, 1325, 4136
3116, 3221, 2151, 5312, 2654, 4314
1651
4316
4524, 6451

2253, 3116, 3451, 2152, 4362, 4316
4316, 4513, 4362, 1156, 2145, 1156
6451, 6361, 5624, 5241, 3346, 1165
3241, 4524, 5436, 5813, 3265, 5624
2453, 3462, 3251, 5445, 8253, 1156
2346, 4853, 6645, 5253, 1325, 4136
3116, 3221, 2151, 5312, 2654, 4314
6234, 4356, 1415, 1435, 1156 4521
2253, 3116, 3451, 2152, 4362, 4316
4316, 4513, 4362, 1156, 2145, 1156
6451, 6361, 5624, 5241, 3346, 1165
3241, 4524, 5436, 5813, 3265, 5624
2453, 3462, 3251, 5445, 8253, 1156
2346, 4853, 6645, 5253, 1325, 4136
3116, 3221, 2151, 5312, 2654, 4314
1651
4316
4524, 6451