Hello again. re adjusting my mileage. I cleaned the tb and maf . I filled to brim with gas and added injection cleaner. I drove 288 km and was five eighths of a tank left.

 

the only way to do meaningful measurements is; fill up; drive a long way; fill up and write down the gallons and miles driven( or km).
divide the gallons into the miles driven. you know,like 300 miles,15 gallons = 20 miles/gal.
your gas gage is pretty good,but no good for meaniingful reports or comparisons.

 

Yes, that's no way to know exactly what your mpg's are. You have to do what Happythree said. Then you will know exactly what you are getting. And the only way to know if you are getting better mpg's than before you cleaned those is if you calculated what your mpg's were before you cleaned them also. That way you would know if you actually improved your mileage. Otherwise it is impossible to know.

 

^^^^ This, There is no benefit in using premium in a Hummer H3, as they are NOT designed ie tuned to take advantage of the extra 'quality' fuel. The octane of the premium fuel stops detonation in highly tuned high compression motors. This is why performance cars generally require premium fuel.

Putting premium in a Hummer would be like putting lipstick on a pig, waste of money and effort, as the H3 engine is tuned and designed to run on regular fuel, and it is unable to take advantage of the added benefits that premium has to offer.

I love the people who say it's only $8 a tank or whatever, I can afford it....what a pointless thing, rather than handing the $8 to the servo operator do something else with it, I am sure no matter how much money you have you can always use it for something other than throwing it away on fuel that makes no difference what so ever, take the $8 and sit down and have a nice relaxing cup of coffee or something, give it to a homeless person, donate it to charity, send it to me.....plenty of options there.

 

I know that is no way to tell. I am going to put what i got out of the tank full. I haven't put any more in since. I sat idling alto though also because i do a fair bit of waiting. I travel ferries and pick people up from them. So i would get better results just straight driving. I have 384km on it and still above a quarter tank.

 

I get almost 500 kms on a tank.

 

i once drove 400 miles till the low fuel light came on,could have made 440??
i was 30 miles from home,didnt have the guts to try it!

 

Once the light came on so i reset the trip odo. Just to see and went another 60 kms. Without running out ran out the next day on my way to fill up tho. Lol. Most vehicles are made to go the extra 40 kms after the idiot light comes on.

 

I get 15.5mpg all HWY-(2006 H3).. That is with rancho 4in, 35in tires,PCM tune and Airdoc to help/hinder..
I used to get much less but took the roof rack off..

 

There is a noticeable difference in drivability and fuel mileage using Shell over everything else in my area, including Mobil. I try to stick with Shell if possible.