[quote=Sid 6.7;354017]
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
Good experiment but some more data is wanted.
The 20F difference in ambient temperature is significant. Did you measure the tire pressures during the end of the drive(hot) or cold?