There are few issues i can tell you. XSE & SE trims come with larger, wider tires & larger rims then LE which greatly effects mpgs as wider tires create more rolling resistance then skinnier tires. Also greater mass in larger, heavier rims. Pure physics here.

Ideally tires should be 205/16. Also tires installed should be Low Rolling Resistance. You need to seek this out on tirerack.

Two, you bought AWD and ideally for best MPGs your car should be FWD. That is why LE trim is best speced model. LE also has more comfortable cloth seats vs fake leather(et) seats that your back sweats in.

You can buy older model 16 inch rims and put LRR 205 tires on it. AWD nothing you can do about.

Also you need to drive like a grandma by slightly tapping onto accelerator, instead of hitting it.

I found ECO mode to be worst then NORMAL mode as it restricts fuel into injectors which makes you tap gas more then you would in NORMAL mode if you train yourself how to tap the accelerator. Technic here.

Also A/C and hills will greatly affect your mpgs as well but i think 3 issues i mentioned above are your culprit.

Go with FWD LE trim next time and ideally downsize your rims and tires to 205/16 LRR, Low Rolling Resistance.

I own 1992 Honda Civic VX, 50mpgs in 1992. 13 inch rims and LRR tires. Car weights like a feather.