E3000 wireless connections not reaching maximum speed

E3000 running 1.0.0.3 firmware on Cox premier 30mb pipe. 2 wireless dell laptops Inspiron 9100 and Vostro 1000running 1350 and 1390 mini wireless g network cards with latest drivers installed. Direct connect machines run at full 30mb connection speedtest.net and Cox's own speed test. Wireless machines sitting next to router with excellent connection showing 48 to 54Mbps capacity but only getting 3-10Mbps throughput on speedtests. Cust Support through level 1, 2 and HQ cannot find the problem. Originally thought it was bad hardware so original router replaced and doing the same thing.
Sincerely appreciate any clues, suggestions or ideas anyone may have. The laptops are both about 5 yrs old or more but they should reach the capacity available, even on G networks, shouldn't they?
Thank you kindly!

How much speed do you get on a wired computer?
Speed test is not always accurate on most of the websites.  You have Cox premier 30mb connection and you are getting 28-30 mbps speed on wireless computer. So I think the speed is pretty good.
If you are still getting slow speed then you can try changing the advanced wireless settings on the router.
Open the setup page of the router. Click on Wireless tab and go to Advanced wireless settings. Change the Beacon interval to 75, RTS threshold to 2307 and fragmentation threshold to 2306. Save the settings.
Go to the setup tab and change the MTU size to 1365. Save the settings. Power cycle the router and observe the speed.

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