Best fertilizer to make your grass fuller?

Best way to make the lawn fuller is to promote lateral growth. Best way to do that is to mow more often.

I watch for a stretch of rain and I drop 13-13-13 on my lawn, a mixture of Bermuda, centipede, and field grass.

When we built our house I sodded about a 1/3 around the house(18 pallets)
of centipede.
The rest I hydroseeded.,It was a mixture of Bermuda and Centipede.
Bermuda is fast germinating,centipede is slower.
Bermuda requires more fertilizer than centipede,the centipede took over and the Bermuda died out over a couple of years.

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I have centipede.

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Careful with the fertilizer then. Centipede is known as the lazy man's grass in that it is generally low maintenance. Slow growing and doesn't like a lot of fertilizer, it thrives in poor soil where other grasses struggle. Over fertilizing is one of the most common ways people kill centipede. Also, it's going to take a while for centipede for really fill in.

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If I laid a Bermuda centipede mix, it doesn’t come up looking like a weird mixture?

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If you do this, depending on how much sun your lawn gets and if you fertilize regularly, expect for the bermuda to take over. Bermuda is the opposite of what I stated above about centipede. It's a nitrogen hog and fast grower. As long as you have enough sun, water, and nitrogen that bermuda will eventually overtake the centipede.

You have a choice to make, bermuda or centipede. If you have limited sun and want a low maintenance yard that you don't need to mow often, centipede is your choice. If you have full sun and don't mind fertilizing a couple of times of year and mowing 2X a week, bermuda would be the option.

Me personally, as long as I have full sun, I'm going bermuda. It is quick to recover from damage (dogs and kids) and weed control is very easy in that celsius knocks out 90% of weeds.

How big is your yard? Are we talking 1/2 acre or less or like 2 acres?

Centipede - 15-0-15 (N-P-K) lawn fertilizer or something very close, with 0 phosphorus (middle number) or near 0. Apply at a rate of 1/2 pound of Nitrogen per 1000 sq ft, which equates to 3 1/3 pound of 15-0-15 per 1000 sq ft. Apply a single application by April 1-15, and if you think it necessary (based on looks) another application at the same rate July 1-15. Often you can skip the mid-summer application. If you want to apply fertilizer now, so do ASAP and water it in. I’m only suggesting that b/c I assume you are in NOLA with a slightly longer growing season, otherwise I’d suggest waiting until next spring to fertilize.

As stated centipede requires very little fertilizer compared to other warm season grasses. It has a naturally yellowish tint, i.e., not as dark green as St Augustine, so don’t over fertilize with nitrogen to make it so.

Most importantly cut it at the proper height, 2 to 2 1/2 inches, which is higher Bermudagrass and shorter than St. Augustine.

If you paid for centipede sod, give a chance to see how you like it and it performs for you. As with all warm season turf grasses, it has pros & cons.

University of FL has the best general guidelines on centipede lawn management Centipede for FL Lawn - this information is applicable to Louisiana lawns as well.