Slight Drop in Gas Mileage with Dinan Flash

Bubbles · 12-23-2007, 11:28 AM

From my rough experiment it appears I lost about 1-2 mpg. I was averaging almost 30 mpg on the highway at cruising speeds now I'm around 28-29 mpg. Just thought you fellas may want to know.

Orb · 12-23-2007, 11:45 AM

Dam, I wish i was getting your numbers.

The stock car was getting 11 to 12.5 MPG on average. I just hit 13+ mpg for the frist time ever with the Dinan flash but will see if that changes as it should.

I should say do mostly city driving. I mentioned that my not so good gas milage to dealer but they said it is about normal

Orb

Bubbles · 12-23-2007, 11:58 AM

Quote:

Originally Posted by Orb

Dam, I wish i was getting you numbers.

The stock car was getting 11 to 12.5 MPG on average. I just hit 13+ mpg for the frist time ever with the Dinan flash but will see if that changes as it should.

Orb

11-13 mpg is that at cruising speeds like a constant 80-85 mph drive?
Well Orb is sounds like your lead foot needs to go on a diet

Driver72 · 12-23-2007, 11:59 AM

Yes, with ANY of the tunes you will get less gas mileage than stock.

Two reasons:

1. More boost = more gas
2. You drive the car harder now with the added power we all love.

On a side note, I'm not sure about the others, but with the PROcede, under normal driving you actually get a bit better gas mileage.
But who with a PROcede (or any other tune) drives the car lightly??

hotrod182 · 12-23-2007, 12:10 PM

I was getting 13mpg when the car was fairly new. However, after a couple 800 mile road trips, my average is all the way up to 17mpg now in 9800 miles of driving. If you are on the HWY, on cruise control at 70mph, you should be getting 28-30mpg on your instantaneous. Any slight up hill grade, or headwind, and it will go down significantly. A slight down hill, and the MPG will sky rocket into the 40's etc. So a slight up hill run may be 1/2 the fuel economy as going the other way downhill on that same road. This is why I think 1/4 mile strips that go uphill take a measurable toll on your performance. An extreme example would be the 6% grade on the 101 fwy down here, 16mpg up hill, and 99mpg down. You can easily achieve 100mph in neutral going down the grade. Another perfect example: did you ever try and push a broken down car up a hill you normally don't even feel when you a driving? Compare that to pushing it in the down hill direction. I'm sure you get my point. Also, our cars probably get the best fuel economy in hot weather. More efficient, less drag. But of course, less power also.

Orb · 12-23-2007, 12:15 PM

Quote:

Originally Posted by hotrod182

I was getting 13mpg when the car was fairly new. However, after a couple 800 mile road trips, my average is all the way up to 17mpg now in 9800 miles of driving. If you are on the HWY, on cruise control at 70mph, you should be getting 28-30mpg on your instantaneous. Any slight hill, or headwind, and it will go down significantly. A slight down hill, and the MPG will sky rocket into the 40's etc. So a slight up hill run may be 1/2 the fuel economy as going the other way downhill on that same road. This is why I think 1/4 mile strips that go uphill take a measurable toll on your performance. An extreme example would be the 6% grade on the 101 fwy down here, 16mpg uphill, and 99mpg down hill. You can easily achieve 100mph in neutral going down the grade.

Good point as I only have 2500 miles on my car. I'm lucky to do 5000 miles a year

Bubbles · 12-23-2007, 12:21 PM

Well, there are no hills here and I am near 10k now, so maybe the mileage improves a bit.

Driver72 I agree about driving the car harder with a tune, but I tested under cruise control with a constant speed. So I agree the boost increase does cause the mpg to decrease.

sflgator · 12-23-2007, 01:27 PM

Quote:

Originally Posted by Driver72

Yes, with ANY of the tunes you will get less gas mileage than stock.

Two reasons:

1. More boost = more gas
2. You drive the car harder now with the added power we all love.

On a side note, I'm not sure about the others, but with the PROcede, under normal driving you actually get a bit better gas mileage.
But who with a PROcede (or any other tune) drives the car lightly??

+1. Yep, those are the reasons for slightly less mpg now...but enjoy!!!

E90ice · 12-23-2007, 01:30 PM

I'm still averaging 20-21 mpg with mostly city driving and fairly agressive.

12-23-2007, 11:28 AM	#1
Bubbles Brigadier General 2753 Rep 4,445 Posts Drives: Green Bastard Join Date: Jun 2007 Location: Bishop Bend iTrader: (3)	Slight Drop in Gas Mileage with Dinan Flash From my rough experiment it appears I lost about 1-2 mpg. I was averaging almost 30 mpg on the highway at cruising speeds now I'm around 28-29 mpg. Just thought you fellas may want to know. __________________
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12-23-2007, 11:45 AM	#2
Orb Lieutenant Colonel 111 Rep 1,764 Posts Drives: 335 Join Date: Jun 2006 Location: Canada iTrader: (1)	Dam, I wish i was getting your numbers. The stock car was getting 11 to 12.5 MPG on average. I just hit 13+ mpg for the frist time ever with the Dinan flash but will see if that changes as it should. I should say do mostly city driving. I mentioned that my not so good gas milage to dealer but they said it is about normal Orb Last edited by Orb; 12-23-2007 at 02:54 PM..
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12-23-2007, 11:59 AM	#4
Driver72 Brigadier General 327 Rep 4,484 Posts Drives: 335i - to new owners now. Join Date: Dec 2006 Location: California iTrader: (0)	Yes, with ANY of the tunes you will get less gas mileage than stock. Two reasons: 1. More boost = more gas 2. You drive the car harder now with the added power we all love. On a side note, I'm not sure about the others, but with the PROcede, under normal driving you actually get a bit better gas mileage. But who with a PROcede (or any other tune) drives the car lightly??
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12-23-2007, 12:10 PM	#5
hotrod182 . 812 Rep 3,974 Posts Drives: 2023 i4 M50 Join Date: Dec 2006 Location: California iTrader: (0)	I was getting 13mpg when the car was fairly new. However, after a couple 800 mile road trips, my average is all the way up to 17mpg now in 9800 miles of driving. If you are on the HWY, on cruise control at 70mph, you should be getting 28-30mpg on your instantaneous. Any slight up hill grade, or headwind, and it will go down significantly. A slight down hill, and the MPG will sky rocket into the 40's etc. So a slight up hill run may be 1/2 the fuel economy as going the other way downhill on that same road. This is why I think 1/4 mile strips that go uphill take a measurable toll on your performance. An extreme example would be the 6% grade on the 101 fwy down here, 16mpg up hill, and 99mpg down. You can easily achieve 100mph in neutral going down the grade. Another perfect example: did you ever try and push a broken down car up a hill you normally don't even feel when you a driving? Compare that to pushing it in the down hill direction. I'm sure you get my point. Also, our cars probably get the best fuel economy in hot weather. More efficient, less drag. But of course, less power also.
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12-23-2007, 12:21 PM	#7
Bubbles Brigadier General 2753 Rep 4,445 Posts Drives: Green Bastard Join Date: Jun 2007 Location: Bishop Bend iTrader: (3)	Well, there are no hills here and I am near 10k now, so maybe the mileage improves a bit. Driver72 I agree about driving the car harder with a tune, but I tested under cruise control with a constant speed. So I agree the boost increase does cause the mpg to decrease. __________________
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12-23-2007, 01:30 PM	#9
E90ice Banned 205 Rep 2,002 Posts Drives: 2008 335xi Coupe Join Date: May 2006 Location: WA iTrader: (0)	I'm still averaging 20-21 mpg with mostly city driving and fairly agressive. __________________
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