Quote:
Originally Posted by eikond
What are you talking about? You clearly need to re-think your understanding of what miles per gallon means and how it's calculated.
If you would have driven another 30 miles you would have use another gallon of gas (a little under).. You can't just keep driving and then use the same calc for your miles per gallon average.
You need to stop putting so much faith in the dash display and start measuring with real life variables..
Here's a proper way to measure gas mileage.
-Fill tank.. allow pump to stop when it reaches pressure level and shuts off automatically.. consider this "full"
-reset one of the trip meters to zero before you leave the gas station.
-Drive car until you are low on gas (at least under 1/4) or until the light comes on.. depends on preference.
-Go to gas station, fill gas tank until pump automatically shuts off. Consider this full.
-Now calculate.. number of miles on trip meter / gallons filled. This is your miles per gallon.
repeat cycle at least three time to get an accurate average.
I put very little stock in the on-board trip computer. I'm normaly surprised if it's within 2 mpgs of reality.
Still, having said that.. 36mpg or anything within 2 of that is a very good result..
I have no doubt the tune improved how the engine runs. I'm sure it's smoother, has more power, and is more fuel efficient.. But I put zero faith in your measurements at this point. Please do them properly and report back to us.
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I've been a little busy so I haven't been reading every post but during this testing it has been discussed and expected that gas milage is calculated with hard math - like quoted above. Anything short of that is useless.
When I get home I'll read thru everything.
John