View Single Post
Old 01-21-14, 11:37 AM   #2
oohpapi44
Lexus Fanatic
Trader Score: (1)
 
oohpapi44's Avatar
 
Join Date: Jul 2005
Location: SouthSide Qns
Posts: 5,768
Send a message via AIM to oohpapi44 Send a message via MSN to oohpapi44 Send a message via Yahoo to oohpapi44
Default

Could've just watched Mythbusters and come to same conclusion.

Quote:
Mythbusters gave these results from their test:

Control, 35psi (manufacturer recomendation)
tyres at 10psi = 3.7% increase in consumption
tyres at 30psi = 1.2% increase in consumption
tyres at 40psi = 6.2% decrease in consumption
tyres at 60psi = 7.6% decrease in consumption

MythBusters: Tire Pressure Test : Video : Discovery Channel

Here is the test done at Ecomodder.com
Experiment: coast down distances (rolling resistance) @ various tire pressures - Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com

PSI/Distance in feet

20 / 479.3
25 / 524.8
30 / 621.0
35 / 621.0
40 / 639.6
45 / 687.5
50 / 702.0
55 / 699.3
60 / 702.0
Not going to be unsafe and 'overinflate' is a misnomer. Tire is rated for 60psi so anything under won't be overinflating. Just exceeding what the manufacturer suggest for optimum ride comfort. You want to bounce around but get more mpg, then you've got plenty of room to play with. Go past what tire is rated for, then we are talking overinflating.

Props for experimenting though.
__________________
Gracie's Page

2001 - GS430, modded a lil bit
2011 - RX450h
oohpapi44 is offline   Reply With Quote