How did I get 15.5 MPG?

[dochummer]

Just drove 700 miles last night. If I kept the cruise on 82 or so, I averaged about 11.3 mpg...same as city ...If I cruised at anything below 70 I averaged 14.5 mpg...

[OrangeCrush]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">
Worst things have happened, at least you didn't call me a self lubricator </div></BLOCKQUOTE>

Well, I was going to tell you to get ....LOL Is that close?

Thanks bud.

Mark

[Nixxxster]

13 mpg in the city?? you must drive really slow, live it a total flat land, and have very few traffic light....

[HUMMERcustoms.com/TAZ]

If You will do a search for Octane You will find allot of info and one will be MY lecture on octane and what it means and why it can be different than what the pump says due to how long or how short of a time it has been in the tank at gas station. I have Buddy in the oil business and actually works with the octane quality etc. he is a chemical engineer with a major oil compnany.
Or You could look up My soapbox lecture and see what He told Me. But, Phil is correct in what He says about octane not helping MPG and that low octane is extremely violent burning that is why You have to go to higher octane to prevent detonation when you switch to forced induction.
Also if You should go to a high flow head as I'm doing later this year You should get one that will flow more air and not increase compresion. If You raise compression with forced induction You are looking for trouble unless you do the bottom end work along with the heads.
Stock rig should do just as well on 87 octane as any of the other and You save money.

TAZ

[Black 05]

90 lbs of air pressure in the tires?????

[DavidAragon]

19mpg NICE!

I just use regular... it's what the book calls for.

I'm sure as soon as I take it off road, it will be down to 2mpg

[Nixxxster]

Can't go 60 on the hwy. The speed limit is 65, slower then that might get you shot

[Jeff Jackson]

2006 Lux H2

Dealer told me removing the roof racks would improve mileage 1 mpg
Did not remove because I like the look

Replacing the exhaust system and air intake system would improve mileage 3-4 mpg
Had that done. More power but mpg remains the same.

Put in BP 89 octane instead of 87 octane
Noticed a marked improvement in performance and mpg

Read this forum and today I put in Sunoco 94 octane
No change in performance but gas mileage actually DECREASED!!!

I'll try one more tank of higher octane and post the results.

[OrangeCrush]

Boy, don't I feel like a dumbass. Phil, you and I are saying the same thing.... that octane rating does NOT increase fuel efficiency.

I must have misread your statement... I don't know how I missed the word "NO" in your statement that said "Octane will make no difference to fuel efficiency. "

I apologize completely. You and I are saying the exact same thing. It was getting late and I must have misread it.

Sorry.

Mark

[GeorgeSSSS]

David:

I have an 05 and have gotten similar milage on long trips. The roads have to be predominatly freeways that are flat and straight [downhill is cheating; sharp curves scrub off momentum], you've got keep it at 60 mph or less, and you need to use the cruise control as much as possible.

Does any of this apply to the trip you took?

Best regards,

George SSSS

[Efrain]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">

I get 10 mpg on long trips and around 8.5 mpg around town. Believe it or not, if I have a strong head wind I will get as low as 6 mpg. </div></BLOCKQUOTE>

PhilD, your mpg's seem more reasonable to me. after 10 months, I still can't shake off the 10.9 mpg average I'm getting. Either my H2 was made on a Monday or those guys are just plain lucky. Also, this is the first time I read (in this forum) about higher octanage giving you higher mpg's. Wouldn't the owner's manual say,"Use 87 octane gasoline unless you want better gas mileage, then use 97 octane" What gives?