My mom is looking to buy a Nissan Altima in the next couple of days, but she are my dad are on ends of whether to go for the 2.5 I4 or the 3.5 V6. My mom likes the better gas mileage and thinks it has plenty of power for her needs, but my dad thinks the 4 cylinders overwork themselves on the highway and on hills, and this car would be used mainly around town, and 2 or 3 long drives a year through the ozarks. My mom doesn't think that the V6 is necessary for the extra money. She definately wants a sunroof, leather seats and alloy wheels, so we went and test drove the 2.5 with the SL package. She currently drives a 3.8 V6 chevy impala with 200 hp. Would the 25 hp loss on the 2.5 altima be that big of a difference in power? What are you alls views on these two engines? Thanks.