The cost benefit logic on tires is different?

Joined
Nov 8, 2019
Messages
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Location
Santa Rosa,ca
Hello,
I paid $6.75/gallon at Costco today. I couldn't help but think about the difference between 10 and 11 mpg.

My entire life the primary reasons to not inflate beyond the door sticker is due to inconsistent mpg improvements to justify the known expense, excessive tire wear, ride quality, and safety concerns due to idiots thinking if 5 is good 15 will be great.

I did the math on my tires and learned the following:
70,000 mile projected life.
$1294.68 installed
$0.0185 tire expenses per mile

If I intentionally destroyed my tires life by half, my tire cost per mile would be $0.037

This means with gas at $6.75 a jump from 10 to 10.58mpg would be a no impact break even point. No impact means that I would actually save $1296 in fuel within 35,000 miles. So I wouldn't have any impact to my wallet in the future, and I would save money within the first tank. If I just wanted to save half of that amount thus saving the other half by the time I would need the 2nd set, I would just need to get from 10 to 10.28mpg. If gas hits $8/gal, 10 to 10.48mpg or 10 to 10.23mpg.

What am I missing?
 
Joined
Nov 17, 2021
Messages
1,672
Location
Arlington, Wa
Hello,
I paid $6.75/gallon at Costco today. I couldn't help but think about the difference between 10 and 11 mpg.

My entire life the primary reasons to not inflate beyond the door sticker is due to inconsistent mpg improvements to justify the known expense, excessive tire wear, ride quality, and safety concerns due to idiots thinking if 5 is good 15 will be great.

I did the math on my tires and learned the following:
70,000 mile projected life.
$1294.68 installed
$0.0185 tire expenses per mile

If I intentionally destroyed my tires life by half, my tire cost per mile would be $0.037

This means with gas at $6.75 a jump from 10 to 10.58mpg would be a no impact break even point. No impact means that I would actually save $1296 in fuel within 35,000 miles. So I wouldn't have any impact to my wallet in the future, and I would save money within the first tank. If I just wanted to save half of that amount thus saving the other half by the time I would need the 2nd set, I would just need to get from 10 to 10.28mpg. If gas hits $8/gal, 10 to 10.48mpg or 10 to 10.23mpg.

What am I missing?

10 mpg @ 6.75 is $.675 per mile
11 mpg is $.614 per mile


So as long as your tire wear is less than $.06 per mile you'd be saving money in the long run.
 

GW Nugget

Do the best you can with what you have...
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Last edited:
Joined
Nov 8, 2019
Messages
51
Location
Santa Rosa,ca
10 mpg @ 6.75 is $.675 per mile
11 mpg is $.614 per mile


So as long as your tire wear is less than $.06 per mile you'd be saving money in the long run.

TLDR: it’s actually a hair under 8 cents in tire damage per mile. Replacing 4.3 sets in the time it takes to replace one set is worth 1 mpg if your starting economy is less 10mpg or less.

Kind of.
If you are paying $0.0185 per mile, then that is the cost of admission and shouldn’t really be considered as “additional.”

$0.675(@10mpg)+$0.0185(w/70k mile tire life)=$0.6935 per mile.

$0.6935=$0.6136(@11mpg)+$0.0185(w/70k)+unknown

Unknown=$0.06136 additional maintenance per mile.

Tolerable Tire damage per mile=($0.06136(additional)+$0.0185(expected))=$0.0798

$1294.68/$0.0798=16,211.132miles
70k/16,211.132=4.3 sets of replacement tires

$5,567 in tires vs $1,294.68 over 70k miles

$4,272 in additional wear

70k*$.675=$47,250
70k*$.6136=$42,954
$47,250-$42,954=$4,296 in fuel savings.

$4,296-$4,272=$24 in savings
 

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