Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Lower rolling resistance: space saver spare tire donuts @70 psi, or RE92's @ 51 psi?

Vekke · 10-10-2011, 08:35 AM

I would say the donuts. If you put there 70 PSI they will contact the road only on the centre. Usually they are already so round that the contact area is very small anyway.

10-10-2011, 08:35 AM	#7 (permalink)
Vekke Mechanical engineer Join Date: Jan 2009 Location: Kitee (Finland) Posts: 1,272 Siitin - '98 Seat Cordoba Vario 90 day: 58.56 mpg (US) VW Lupo 3L --> 2L - '00 VolksWagen Lupo 3L Diesel 90 day: 104.94 mpg (US) A8 luxury fuel sipper - '97 Audi A8 1.2 TDI 6 speed manual 90 day: 64.64 mpg (US) Audi A4B6 Avant Niistäjä - '02 Audi A4b6 1.9tdi 96kW 3L 90 day: 54.57 mpg (US) Tourekki - '04 VW Touareg 2.5TDI R5 6 speed manual 90 day: 32.98 mpg (US) A2 1.4TDI - '03 Audi A2 1.4 TDI 90 day: 45.68 mpg (US) A2 1.4 LPG - '02 Audi A2 1.4 (75hp) 90 day: 24.67 mpg (US) Thanks: 270 Thanked 841 Times in 414 Posts	I would say the donuts. If you put there 70 PSI they will contact the road only on the centre. Usually they are already so round that the contact area is very small anyway. __________________ https://www.linkedin.com/in/vesatiainen/ Vesa Tiainen innovation engineer and automotive enthusiast