Will one Size make a big difference?
Smarter than most Racoons
Joined: Aug 2018
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.5
More more mpg or less? A 285 with the same profile, say - 70, wil be taller; more circumference. Your friction is a tiny bit more but your mpg should go up UNLESS you use more throttle, trying to maintain the same acceleration as you had before.
265/70 16" 30.6" tall 96.1" circum
285/70 16" 31.7" tall 99.6" circum +3.6%*
285/65 16" 30.6" tall 96.0" circum
*This makes a 3.55 feel like a 3.43.
300 miles on a tank could yield 11 more.
Depends on your foot. 😉
A 20 sec quarter might become 20.7 sec.
Nothing is 100% so simple and linear, but it's a way to generalize the effects you might see.
Under 3.55 there used to be a [discontinued] 3.37(?) I would like that. Others would go the other way. Different needs and goals.
I ordered my '76 Dodge Maxivan w a 360 and 2.71... made it like a 318, but the 360 was an actual truck engine. The calibrated computor said I got 16mpg w a 3 speed auto w/o lockup. 120 in 2nd. (In '77 you could get a 4spd stick. 😖
BillSF9c
265/70 16" 30.6" tall 96.1" circum
285/70 16" 31.7" tall 99.6" circum +3.6%*
285/65 16" 30.6" tall 96.0" circum
*This makes a 3.55 feel like a 3.43.
300 miles on a tank could yield 11 more.
Depends on your foot. 😉
A 20 sec quarter might become 20.7 sec.
Nothing is 100% so simple and linear, but it's a way to generalize the effects you might see.
Under 3.55 there used to be a [discontinued] 3.37(?) I would like that. Others would go the other way. Different needs and goals.
I ordered my '76 Dodge Maxivan w a 360 and 2.71... made it like a 318, but the 360 was an actual truck engine. The calibrated computor said I got 16mpg w a 3 speed auto w/o lockup. 120 in 2nd. (In '77 you could get a 4spd stick. 😖
BillSF9c
When I switched from Goodyear 265/70 to Cooper 285/70 LT tires I lost ~.5 MPG. The tires were a lot heavier too. The 265s were not LT tires while the 285s I bought are.
The coopers were much quieter also. and I recommend them to anyone who asks. Cooper Discoverer AT3 XLT.
Senior Member
Joined: Oct 2017
Posts: 1,728
Likes: 440
From: CA near Frisco
Will one Size make a big difference.
When I switched from Goodyear 265/70 to Cooper 285/70 LT tires I lost ~.5 MPG. The tires were a lot heavier too. The 265s were not LT tires while the 285s I bought are.
The coopers were much quieter also. and I recommend them to anyone who asks. Cooper Discoverer AT3 XLT.
The coopers were much quieter also. and I recommend them to anyone who asks. Cooper Discoverer AT3 XLT.
But perhaps the stiffer sidewalls of the LT285 is the reason. Manufacturers say it does just this.
BillSF9c
has left the building
Joined: Jan 2020
Posts: 9,647
Likes: 3,421
More more mpg or less? A 285 with the same profile, say - 70, wil be taller; more circumference. Your friction is a tiny bit more but your mpg should go up UNLESS you use more throttle, trying to maintain the same acceleration as you had before.
265/70 16" 30.6" tall 96.1" circum
285/70 16" 31.7" tall 99.6" circum +3.6%*
285/65 16" 30.6" tall 96.0" circum
*This makes a 3.55 feel like a 3.43.
300 miles on a tank could yield 11 more.
Depends on your foot. 😉
A 20 sec quarter might become 20.7 sec.
Nothing is 100% so simple and linear, but it's a way to generalize the effects you might see.
Under 3.55 there used to be a [discontinued] 3.37(?) I would like that. Others would go the other way. Different needs and goals.
I ordered my '76 Dodge Maxivan w a 360 and 2.71... made it like a 318, but the 360 was an actual truck engine. The calibrated computor said I got 16mpg w a 3 speed auto w/o lockup. 120 in 2nd. (In '77 you could get a 4spd stick. 😖
BillSF9c
265/70 16" 30.6" tall 96.1" circum
285/70 16" 31.7" tall 99.6" circum +3.6%*
285/65 16" 30.6" tall 96.0" circum
*This makes a 3.55 feel like a 3.43.
300 miles on a tank could yield 11 more.
Depends on your foot. 😉
A 20 sec quarter might become 20.7 sec.
Nothing is 100% so simple and linear, but it's a way to generalize the effects you might see.
Under 3.55 there used to be a [discontinued] 3.37(?) I would like that. Others would go the other way. Different needs and goals.
I ordered my '76 Dodge Maxivan w a 360 and 2.71... made it like a 318, but the 360 was an actual truck engine. The calibrated computor said I got 16mpg w a 3 speed auto w/o lockup. 120 in 2nd. (In '77 you could get a 4spd stick. 😖
BillSF9c
Senior Member
Joined: Oct 2017
Posts: 1,728
Likes: 440
From: CA near Frisco
@BillSF9c , did you realize you quoted a comment that was made 5.5 years ago?
BillSF9c
Senior Member
Joined: Oct 2017
Posts: 1,728
Likes: 440
From: CA near Frisco
@BillSF9c , did you realize you quoted a comment that was made 5.5 years ago?
BillSF9c