Tire Pressure Max

[Yaris Revenge]

I'm not gonna' rag on over-inflation... hypermiling is just plain weird in the first place. Here's my math, please correct me if it's wrong (I suck at math).

Yaris fuel capacity= 11 gallons
Cost of fuel= let's say a nice even $3/gallon
EPA estimate highway= 40mpg
Estimated range for normal driving then= 440 miles
BailOut's range @ 44mpg= 484 miles

BailOut travels 44 miles further on a tank of gas. That's roughly one gallon of fuel he saved compared to a normal driver.

Back to the top, one gallon of fuel costs $3.

Using all the crazy and sometimes dangerous driving techniques that hypermilers use, the driver has managed to save a measly $3 per fillup.

Using this math (which again, could be wrong) I just don't see how anyone can justify dangerous driving techniques. I say drive reasonably and give up one tall (aka "small") Caramel Macchiato from Starbucks. You'd save the same amount.

~YR

[BMGYaris]

Originally Posted by Yaris Revenge

EPA estimate highway= 40mpg


Using this math (which again, could be wrong) I just don't see how anyone can justify dangerous driving techniques.

~YR

Hey, well first off I wanted to say that while I do not condone the hypermilling techniques.
Nontheless. The risk of overinflation are pretty simple, and if you do a search around the internet you will find that it is not nearly as dangerous as underinflation. The risk of overinflatoin, as best I can tell are :

1) The thread in the center of the tire will wear out more quickly
2) That it will puncture a bit easier
3) Once the threads are worn down it will puncture much more easily.

Now, because of his hyper milling attitude he has changed other things as well:

1) he tries to maintain about 48mph, or so i hear, and even slower
2) he plans ahead, watches traffic, and is constantly aware of obstacles, pot holes, and general hazards--he takes driving seriously, not fucking around.

I dont have any statistics, but im pretty sure that by cutting back on his speed so drastically and by having his extra care attitude and concern for cautious, intelligent and safe driving on the road--the very concern that caused him to pump up his tires--will in fact make him and everyone else around him much safer. If you had the percentages I am sure that he averages out to be a much safer driver than myself and every other person I know, just based on increased risk of tire blow outs and decreased risk of highspeed crashes.

However, there is another major increase in safety, there is no doubt in my mind that this mother fucker checks his god damn tires every fucking morning. You wont find him without threads on his wheels--but you might find me. You wont find him underinflated--but you might find me. And most people--but not him, because of his overinflation, and his general attitude, I am sure he is much safer and his car is in prestine condition. I think---but i cant find any actual stats or solid information on overinflation--everything focuses on underinflation. still, that is based on what i have gathered thus far, and it seems reasonable.

[PetersRedYaris]

Originally Posted by BMGYaris

I cant find any actual stats or solid information on overinflation--everything focuses on underinflation...

People fail to maintain their cars properly ,including tire pressure, and this is the reason for the focus on underinflation. If you neglect your tires, eventually the pressure will drop creating a dangerous situation. This is a COMMON problem. Overinflation is not a common problem as tires do not spontaneously jump up in pressure. Someone has to overinflate them on purpose. I'm sure after this "hypermiling" trend becomes more well known, and a few 60 PSI tires blow violently causing mayhem on the freeways, the danger of overinflation will spark a few tire pressure studies focusing on overinflation.

[Nimble]

Originally Posted by PetersRedYaris

People fail to maintain their cars properly ,including tire pressure, and this is the reason for the focus on underinflation. If you neglect your tires, eventually the pressure will drop creating a dangerous situation. This is a COMMON problem. Overinflation is not a common problem as tires do not spontaneously jump up in pressure. Someone has to overinflate them on purpose. I'm sure after this "hypermiling" trend becomes more well known, and a few 60 PSI tires blow violently causing mayhem on the freeways, the danger of overinflation will spark a few tire pressure studies focusing on overinflation.

99% true, but tires do increase pressure on their own as temps increase (you probably already knew that). I've heard that for every 10degree F increase, the tire pressure goes up 1 lb.

[PetersRedYaris]

Originally Posted by Nimble

99% true, but tires do increase pressure on their own as temps increase (you probably already knew that). I've heard that for every 10degree F increase, the tire pressure goes up 1 lb.

Exactly, I should have included that.

[PetersRedYaris]

This has been stated before, however, people keep making posts about the tires increase in temperature leading to over MAX pressure recommendations. The max pressure written on the side of the tire is a COLD max pressure. So, if it is 45PSI max, the tire manufacturer knows the tires will heat up thereby increasing the pressure above the max. This does not mean you have to calculate the real max pressure based on your local driving conditions and temperatures. It is recommended you check or adjust tire pressures in the morning before any substantial driving. You can set it at 45PSI. Yes, it will go above 45PSI when you drive fast or as the day gets warmer but that is already figured in.

[BMGYaris]

Originally Posted by Yaris Revenge

I'm not gonna' rag on over-inflation... hypermiling is just plain weird in the first place. Here's my math, please correct me if it's wrong (I suck at math).

Yaris fuel capacity= 11 gallons
Cost of fuel= let's say a nice even $3/gallon
EPA estimate highway= 40mpg


~YR

_______________

As for your numbers, new EPA ratings put the yaris at 36 highway and 32 combined
http://www.fueleconomy.gov/feg/calcu...umn=1&id=22750

That means that if our man is using highway figures it is just as the frenchman prooposed, and if he is giving you combined then it is even better. Also, but it in terms of hours worked. if he can save 9 bucks at the fill up, thats going to be more than 1 hour of work saved per tank, which is significant (for me as a student I only make 7 bucks an hour:), you can figure out your own).


But, and i think you will like this one if your with me, Say at EPA ratings at 11 gallons with 36mpg, we can drive 396 miles per tank right? now (lets just say we are doing the whole tank on the highway since we are using the highway EPA figures) so we average 80mph. At 80 mph it will take us 396/80=4 hrs 57 minutes. Now if he averages 50 mph it will take him 396/50=7hrs 55min.

He lost three hours, and he still has 2.9 gallons of gas left, around here that is about 9 bucks, and my 1 hour is usually worth more than 3 bucks to me so in my mind, that isnt worth it. Of course, in a heavy commute is when I imagine his numbers shine the best because they will usually take the same time, but you can work those out on your own, im tired of this now:)

At any rate, i think he is probably balancing it out more than equally wherein safety is concerned.

[AustinYaris]

Originally Posted by Yaris Revenge

BailOut's range @ 44mpg= 484 miles

BailOut travels 44 miles further on a tank of gas. That's roughly one gallon of fuel he saved compared to a normal driver.

~YR

YarisRevenge,

Just a quick note: BailOut has improved his MPG to 49 lately. 44 is an average of all his tanks from the very beginning.

There are lot of more skilled hypermilers who get 59MPG on a regular gas ACCORD for example. So there's actually LOTS of room for improvement on our Yarises.


Also a note on hypermiling... yes, I agree with you guys. Some of the techniques are not very safe...hypermilers are aware of this, and we'd be the first ones to admit it. But I would have to say it's still much safer than people driving while talking on their cell phones.

Also, at least for me, I don't do "all this work" to get save just a couple of bucks. I really enjoy it more as a hobby, a sport, the challenge of trying to reach 50+mpg.

[Pavel Olavich]

Originally Posted by Yaris Revenge

I'm not gonna' rag on over-inflation... hypermiling is just plain weird in the first place. Here's my math, please correct me if it's wrong (I suck at math).

Yaris fuel capacity= 11 gallons
Cost of fuel= let's say a nice even $3/gallon
EPA estimate highway= 40mpg
Estimated range for normal driving then= 440 miles
BailOut's range @ 44mpg= 484 miles

BailOut travels 44 miles further on a tank of gas. That's roughly one gallon of fuel he saved compared to a normal driver.

Back to the top, one gallon of fuel costs $3.

Using all the crazy and sometimes dangerous driving techniques that hypermilers use, the driver has managed to save a measly $3 per fillup.

Using this math (which again, could be wrong) I just don't see how anyone can justify dangerous driving techniques. I say drive reasonably and give up one tall (aka "small") Caramel Macchiato from Starbucks. You'd save the same amount.

~YR

YarisRevenge, your math has a BIG FLAW....you make the mistake of using the EPA 34/40....what you should have done was use real world, what most people get driving "normall"....which is more like 25/34, and not 34/40, so if you correct your math, then the savings is a hell of a lot more then $3/tank full, and this savings adds up over many many tank fulls. The actual savings is more like $7.50+ per tank full. Over a years time, you will save a lot of $$.

Did you go to college?!? BailOut is doing the right thing, and there is vertually NOTHING inherently dangereous about most hypermilling techniques.