Better actually mileage then computed?
 

I have a very strange but good experience. When I calculate the actual mileage on my 08 HCH (miles/gallons) it is higher than what the computer calculates. I always heard stories about the computer inflating the mpg numbers but mine is the other way around, not that I am complaining. Is this happening to anyone else? By the way, I'm getting over 50 mpg on my 40 minute drive to work.

Re: Better actually mileage then computed?
 

My calculated seems to average around 1.5 mpg better than computed.:)

Re: Better actually mileage then computed?
 

Known "issue"... the error range seems to be 0.5 to 2.0, always with hand-calculation being higher.

Re: Better actually mileage then computed?
 

So what did the tank pictured in your signature calculate out too?

I always calculate higher if I'm below about 54mpg. However, if I'm above 54, I calculate 1-2 mpg lower than the computer (every time but once). That doesn't seem to be the norm around here though--even among people who get really high mileage.

Re: Better actually mileage then computed?
 

mine seems to be 1-2mpg higher when hand calculated versus the computer - all the way up above 60mpg.

Re: Better actually mileage then computed?
 

Delicious irony that I just posted the Excel sheet I use (See the 'Estimate my mileage' thread), but that tank would work out to 62.96mpg using the by-hand method.

Re: Better actually mileage then computed?
 

Yeah, my hand calculations are always higher. There has been a time or two, however where it was really close.

I've heard the HCH II's system calculates lower vs the HCH I's calculating higher.

Re: Better actually mileage then computed?
 

My computed mpg vs. the HCH's calculation is always higher, varying from very close to a 2-3 mpg difference. I find the ScanGauge is usually very close, within a couple of tenths of an mpg (although it ruins some of the fun at calculation time!). I also find a difference between the ScanGauge and the HCH's MPG gauge, with the ScanGauge tending to run higher, longer.

Re: Better actually mileage then computed?
 

What I calculate at the pump averages 1.4 MPG better than what the dash says.

This is for 45 tanks.

Re: Better actually mileage then computed?
 

My lifetime average displayed is 5.50 L/100 km, and lifetime actual filled petrol is 5.30 L/100 km. So the display shows a 4% pessimistic value. That's at close to 30 000 km.