What's your MPG?

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Re: What's your MPG?

Postby jeff's93astro » October 7th 2009, 4:38am

both have 255/70/r15
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Re: What's your MPG?

Postby astroturf » October 7th 2009, 4:45am

jeff's87astro wrote:both have 255/70/r15


Yup bigger than stock. Have you corrected the speedo for this? Jim
My Cup is neither half empty nor half full... But has a hole in it. Holy Cup Holders Batman. LOLz, Jim
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Re: What's your MPG?

Postby jeff's93astro » October 7th 2009, 4:48am

no when i put the tires on it i did a test run with a GPS and its dead on
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Re: What's your MPG?

Postby astroturf » October 7th 2009, 4:55am

jeff's87astro wrote:no when i put the tires on it i did a test run with a GPS and its dead on


Stock size for that model was 215/75 15 with a diameter of 27.7 inches, new tires are 255/60 15 with a diameter of 29.1 inches. Unless you have altered something to compensate for that change then: When speedometer reads 60mph (96.6km/h) actual speed will be 63.1mph (101.6km/h): 5.2% faster. Which means you're traveling further than your speedo says, hence your getting better mpg than you think. Jim
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Re: What's your MPG?

Postby jeff's93astro » October 7th 2009, 5:03am

i dont know if it was off before the tire change because the original owner parked it for six years so i never got it over 35mph before i changed the tires since they where dry rottted
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Re: What's your MPG?

Postby jeff's93astro » October 7th 2009, 5:24am

just went out to my van and checked the sticker on the door the factory tire size for it is 205/75/r15
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Re: What's your MPG?

Postby astroturf » October 7th 2009, 5:31am

jeff's87astro wrote:just went out to my van and checked the sticker on the door the factory tire size for it is 205/75/r15


That makes it a much bigger change then. When speedometer reads 60mph (96.6km/h) actual speed will be 64.4mph (103.7km/h): 7.3% faster.
If you factor in the new figures, your actual/real time mpg isn't bad at all. Jim
My Cup is neither half empty nor half full... But has a hole in it. Holy Cup Holders Batman. LOLz, Jim
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Re: What's your MPG?

Postby jeff's93astro » October 7th 2009, 5:55am

lets say i'm getting 15 then how do i figure + 7.3% to that
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88 Silverado 5.3L 2wd 4/6 drop
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Re: What's your MPG?

Postby astroturf » October 7th 2009, 6:07am

jeff's87astro wrote:lets say i'm getting 15 then how do i figure + 7.3% to that


Yes, Jim
My Cup is neither half empty nor half full... But has a hole in it. Holy Cup Holders Batman. LOLz, Jim
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Re: What's your MPG?

Postby jeff's93astro » October 7th 2009, 6:11am

i came up with 16.095mpg but that still dont seem much better?
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Re: What's your MPG?

Postby astroturf » October 7th 2009, 6:19am

jeff's87astro wrote:i came up with 16.095mpg but that still dont seem much better?


Well you are pushing a much heavier tire. As could be seen in the small increase of 7.3% due to tire diameter, there could be a further increase based on tire rolling resistance. But, hey they do look good on that van. So enjoy it, Jim
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Re: What's your MPG?

Postby jeff's93astro » October 7th 2009, 6:29am

i'm thinking about going down to 235/75/r15 but thank you for the help
95 Astro 5.3L RWD 3/3 drop
88 Silverado 5.3L 2wd 4/6 drop
03 Suburban 5.3L 2wd 3/5 drop
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Re: What's your MPG?

Postby astroturf » October 7th 2009, 6:36am

jeff's87astro wrote:i'm thinking about going down to 235/75/r15 but thank you for the help


Check out this link. Maybe it'll help in your tire size decision.
http://www.wheelsmaster.com/rt_specs.jsp
Jim
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