Tires with different max PSI
 

I have 2 different brands of tire on my car. They are all the same size but have different max PSI ratings. The front pair have a max of 44 and the rear set max is 35. I had them inflated to max with Nitrogen today, 44PSI front and 35 PSI back. I was wondering how this might effect safety and MPG of my car.

It's a 1993 Plymouth Voyager with a 2.5l 4cyl. 95% of my driving is under 35mph, short trips where the engine never really warms up. I am guessing under these conditions I'm not going to see any difference in MPG.

I was thinking of trying a hot air intake but I'm unclear as to how that works. I always heard that your car performs better with cooler air from outside the hood.

Any input would be appreciated. Thanks

Welcome to the site.

You might want to check this thread for info about CAI vs. Warm/Hot Air Intake:
Cold air VS Warm Air Intakes - what's the difference?

inflation pressure
 

I do not have any current data.The data I do have suggests that while under-inflation robs fuel,over-inflating shows no significant improvement in economy,and can have a deleterious effect on brake bias,effecting oversteer/understeer characteristics of the vehicle.Inflation pressures are established by the carmaker for brake bias,favoring understeer,where the front tires break loose first,and a simple steering input restores direction.Personally,I'd stay with carmaker specs,regardless of max. pressure ratings.Saving a fraction of fuel is not worth your safety.