23 AVERAGE MPG'S
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Junior User
Joined: Nov 2012
Posts: 87
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23 AVERAGE MPG'S
Since the purchase of my ScanguageII in December, I have really been trying to increase my MPG's. For the last few weeks I have been consistantly breaking 22 average mpg's on my 70 mile morning commute. I have even busted 23 average mpg's a few times.......Can this be correct?
Token Redneck
Joined: Jun 2007
Posts: 9,339
Likes: 350
From: Breckenridge, TX
My Edge CTS says 20+ regularly, and I'm barely cracking 15mpg on paper.
It does a weird weighted average, seems like coasting on the highways counts for way more than idling stopped hurts. No way I'm getting 25mpg in Dallas traffic and barely hitting 13 on the interstate. It's whacked out and I don't trust is at all.
It does a weird weighted average, seems like coasting on the highways counts for way more than idling stopped hurts. No way I'm getting 25mpg in Dallas traffic and barely hitting 13 on the interstate. It's whacked out and I don't trust is at all.
Lead Driver
Joined: Oct 2010
Posts: 5,420
Likes: 16
From: Ouray, CO
Realize you can cruise at steady speed on flat terrain and get 22mpg. But you lift to slow down and sg2 shows 50+, then you step on the skinny pedal to speed up and get 8 mpg. stop in traffic 0 mpg. Go on green light get 6 mpg.
The computer programmer in me says....use (mph / gph) to get to instantaneous mpg. Sampled x times per sec to extrapolate approx mpg since last reset. Mte could be the mpg of say last 100 miles So, drive steady speed for a long time with minimal speed changes computer is close to hand calc. Stop n go traffic lots of varying throttle position changes computer is less accurate.
The computer programmer in me says....use (mph / gph) to get to instantaneous mpg. Sampled x times per sec to extrapolate approx mpg since last reset. Mte could be the mpg of say last 100 miles So, drive steady speed for a long time with minimal speed changes computer is close to hand calc. Stop n go traffic lots of varying throttle position changes computer is less accurate.
Fleet Owner
Joined: Apr 2012
Posts: 27,307
Likes: 549
From: Spanaway
I know for a fact that I can get 21.5 MPG hand calculated.
The requirements are Unloaded,more or less level freeway
and steady peddle.
So 23 YES.
Around town
14.5MPG
Sean
The requirements are Unloaded,more or less level freeway
and steady peddle.
So 23 YES.
Around town
14.5MPG Sean
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Posting Guru
Joined: Jun 2012
Posts: 1,171
Likes: 2
In my experience once you get the SG zeroed in it can be pretty accurate. I also know that the thing that kills fuel mileage in my truck is cold starts, followed by stop and go city driving. Even accelerating out of a gas station up an on-ramp to the freeway kills my mileage and it takes a hundred miles to get the average back down. But if I were to punch the trip set on the freeway and soft-pedal till I got off I would almost always see 22 - 23 for that portion of any highway trip.
Brian
Brian
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Lead Driver
Joined: Oct 2010
Posts: 5,420
Likes: 16
From: Ouray, CO
Except they are discussing MUCH higher numbers...
"I only get 39 MPG, and my neighbor gets 51"
The same laws of physics apply, steady speed, rate of acceleration, only "idling" doesn't always apply, but re-charging the battery from home electricity alters the formula.. in more ways..
I just enjoy driving my Ex and "try" to be wise with my rate of fuel consumption, yet still have FUN..
. 
Fleet Owner
Joined: Apr 2012
Posts: 27,307
Likes: 549
From: Spanaway
And THEY have this same discussion...
Except they are discussing MUCH higher numbers...
"I only get 39 MPG, and my neighbor gets 51"
The same laws of physics apply, steady speed, rate of acceleration, only "idling" doesn't always apply, but re-charging the battery from home electricity alters the formula.. in more ways..
I just enjoy driving my Ex and "try" to be wise with my rate of fuel consumption, yet still have FUN...
Except they are discussing MUCH higher numbers...
"I only get 39 MPG, and my neighbor gets 51"
The same laws of physics apply, steady speed, rate of acceleration, only "idling" doesn't always apply, but re-charging the battery from home electricity alters the formula.. in more ways..
I just enjoy driving my Ex and "try" to be wise with my rate of fuel consumption, yet still have FUN..
. Sean
Posting Guru
Joined: Oct 2006
Posts: 1,693
Likes: 7
From: Francestown, NH
I keep EVERY SINGLE fuel receipt and I write the odometer on it. I plug that into an excel sheet when I get home and it keeps a true longterm eye on my mpg. Every now and then I'll look just at the last 4 weeks to see if it's trending down which could indicate an issue.
I can tell for sure that having bought X many thousands gallons of diesel and driven X many thousands of miles that my hand calculated mpg number is spot on ... but it's no where near my lie-o-meter. That's off by 3.5 so I ignore it. (Edit: It's high by 2.6 - I was thinking of something else when I wrote 3.5)
But of course YMMV 'your mileage may vary' ....
