How many psi can I inflated my tires up to?

I put the Yokohama Geolander HTS on my Honda Element a few months back.

On the pluses - I love the handling (more responsive in turns) and the road noise has gone down.

On the negatives - at 32 psi front and 34 psi rear, the acceleration seems to have taken a hit and my MPG have gone down about 2 mpg.

What sort of psi are those of you with this tire running? It has been a while since I considered deviating from the auto-manufacturer's psi specs, but I'm considering it here.

Yoko's specs are (I'm not even sure what this means so someone help me out) maximum load at cold tire pressure of 1709 @ 35psi. Sidewall says to not exceed 40psi to seat beads.

Could I do 38 psi on all 4 sides? Or front-36 psi, rear 38 psi?

The recommended tire pressure specs were for the stock tires that came with my element.

If your new tires have a larger diameter than the originals, the speedometer and odometer will read lower, and that might make you think the acceleration and mpg are lower.

Yeah, your Element is a real accelerator… If you want that road noise and rough ride, then by all means, pump them up

I'd try 2 psi higher all round, i.e. 34 front and 36 rear, and see how that goes. I wouldn't go any higher.

I worked at a Mitsubishi dealer for 6 years and the Montero Sports and Montero's came with Yokohama tires. I considered them junk. The tires have weak side walls and you get body roll on turns because of the lack of good belts in the tires. Try running the pressures 2 PSI higher on the tires.
Next time you need tires try Michelin Defenders. They have firm belts and a smooth ride with low noise.

Would better tires help increase my trucks top speed and handling as well? What are some good tires to achieve that goal for my truck? I know there are PLENTY of other box like trucks that can AT LEAST hit 110 mph! So aerodynamics is not a good excuse as to why I can't achieve my goal. The Engine and 4 speed auto should at least top out to 120 before drag has any effect in going past that.

The softer tier causes more road friction, hence the lost performance. The Yokohama is made to run at 34, and at that pressure you will get better tier wear and they will last a bit longer. You gain one thing and loose another, that is the way it is!

The pressures for the tires you are running is on the side walls. The pressures listed on the car plate it for the original tires. Use the pressures on the tires, not plate after changing tires.

Try 36 all round, if that doesn't work put 38 in the front and 36 in the back