I have run 45 psi in the tires on my minivan with no problems.This was even in summer but I don't normally drive more than 55 mph on my daily drive to work.
I have gotten 30 mpg using a light foot.

 

[:-]awesome!!!!!!

 

I have a 2004 grand caravan with the 3.3l. I was wondering the average you guys get per tank. I am in Canada and averaging 325-340 kms per tank. that is when the fuel loght comes on. I thought was really low, thinking I should get some more mileage out of the tank

 

I would like to give all of you a little tip, even tough all of everybodies tips are great you have to realize that the 3.3L engine has a intake gasket sealing problem. you can get the seals just about everywhere and they are not expensive but the job will take a experience diy about 3.5-5 hours to complete. but this will resolve the high fuel consumption and you may not have notice the high reving in park or nuetral, rpms should be around 750 in nuetral and 600 in gear.
I replace my gaskets after the engine light always was on and was getting only 500 kms tops to a tank. now i get 650 to a tank of gas.
hope you all do this and please remember to replace both upper and lower gaskets and this is also a good time to do the valve cover gaskets and spark plugs.

 

I'm gettin 560km on 66lts this is with winter tires on, during summer I was getting 600km per 60ltrs with summer tires. Think it'stime to switch back to summer tires ,