[Sid 6.7]

Since the conditions were so similar, I thought it would be releveant to present the information I found this weekend.

My car is a 2007 Fit Sport AT with 10,000 miles now. Only mods to the car are the following:

• Royal Purple Fully Synthetic Race Oil 10W30 (1/2 quart low on purpose)
• Sid Short Ram intake system
• 15"x7" Konig Next wheels with Hancook Ventus HRII 205/50/ZR15 tires filled with nitrogen
• About 500lbs total cargo (people and luggage)
• No spare tire/jack
• A/C was run sporatically both trips
• Cruise control set at 75mph constant

Trip #1
Miles = 6,500 odometer
Exterior Ambient Temp = 70
Tire Inflation = 45psi Cold
Distance = 150miles
Mileage = 43.8mpg

Trip #2
Miles = 10,000 odometer
Exterior Ambient Temp = 90
Tire Inflation = 34psi Cold
Distance = 146miles
Mileage = 40.3mpg

I knew that running less tire pressure would result in lower mileage, but with my back, I needed the extra amount of cushion afforded by the softer tires.

I must say, it was a lot more comfortable on this trip compared to the last. My wife did not complain as she did last time.

The steering was a little numb, and a little slow on initial turn-in response. Handling also suffered slightly with less tire pressure.

I think the loss of a little over 3mpg was worth the softer ride.