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DifferentPointofView · 03-19-2008, 11:20 PM

but you are comparing different rim sizes, which adds unsprung weight to the tire, more weight on the tire=higher rolling resistance. You need to do say a 180/40R14 tire and compare it with a 180/50R14 tire on the same rims.

03-19-2008, 11:20 PM	#16 (permalink)
DifferentPointofView Giant Moving Eco-Wall Join Date: Dec 2007 Location: The Dale, IL (or A-Dale) Posts: 1,120 The Jeep! - '95 Jeep Grand Cherokee ZJ Laredo 90 day: 23.75 mpg (US) The Caliber - '07 Dodge Caliber R/T 90 day: 30.6 mpg (US) The 'Scort - '98 Ford Escort LX Thanks: 0 Thanked 7 Times in 6 Posts	but you are comparing different rim sizes, which adds unsprung weight to the tire, more weight on the tire=higher rolling resistance. You need to do say a 180/40R14 tire and compare it with a 180/50R14 tire on the same rims. __________________ Yea.. I drive a Jeep and I'm on a fuel economy site, but you just wouldn't understand... "It's a Jeep thing!" Jeep Wave *Did I Use Too Many Abbreviations? Here's The Abbreviations List*