With hugh maps, if you declare war on someone tha is not adjacent to you, by the time you reach each other the units are obsolete.
Could be a strategy to declare war and then wait for them to get to you years later

, kill them all and then negotiate a good deal.
That depends Goodfool. It depends alot on what the techrate was set at. This is the CnC forum so I presume youve played a mod or two.
THe most common mistake is not uppin the tech rate to match a increase in the map size
THe deafult for 'huge' is 400. I play on atleast 650-700 when I go 186x186.
I bet a 800 or so tech rate would be nice fit for a 'no city error' max size of 226x226.
BIg maps mean bigger econmy thus faster turnover. The mod Balancer Reload increased the "COST"of its techs and the techrate
It has 1000 units and many great upgrades lines. For instance with tanks, say early tank-light-mid-heavy-postmodern-hovertank. Why go to work fillin out all those distinct pedia entrys and cultural distinctions set with smooth graphics if you not given the player a chance to play with all these new toys
ANother crucial tip. Rival tech advancement comes early on huge maps and can discourage. THe key to solving this (making it more real ,therfore fun, by steadying the flow) is by making the civs a lil bit more spread-out at the start. This has two positve effects :
1.Makes the amount of early trade encounters more rare.
2. Later down the line You will have better compitition and even sized nations in relation to eachother will fill your world. Wait n see! THis Results cuz They had a chance to establish themselves before early war switched them to military production so have built up a nice econmy to keep pace with the tech race down the road where the majority would have started to slow down. (giving you an edge by ringing in mega gold by obsolete tech sales, RIght

)
With this change there won't be such a gap between world powers. Since most form to be even sized before the 1st wars break out, if they conquer another its usually by using allience., meaning more then one civ will benifit. Whats best is Some great battles will ensue and more real action(IMO) will result from you havin to be careful with more of you neighbours.
THe default distance between is 24. On a map over 180x180 continent I suggest 35-40 is ideal