DIC Mileage Challenge Results

On Oct 12, 5:02*pm, "Spud" > wrote:
> 2008 Z06
>
> 3000 total miles.
>
> New Mobil 1
>
> Tires @ 31 psi
>
> CITY DRIVING
>
> Includes numerous 0-80 mph WOT jaunts. I just can't help it.
>
> 61.5 miles divided by 6.086 gallons = 10.11 miles per gallon
>
> DIC mileage = 11.2
>
> Ave. speed = 18 mph
>
> DIC ERROR * * = (10.11 - 11.2)/10.11 * 100
>
> * * * * * * * * * * * * = 10.8% HIGH
>
> THE TRIP
>
> Trip was Fresno to Modesto CA two (2) times.
>
> Leg #1 - Fresno to Modesto
>
> Distance = 95.2 miles
>
> Ave. mph = 50.6 Includes 20 miles of getting out of and into town.
>
> DIC mileage = 22.0 mpg.
>
> Leg #2 - Modesto to Fresno and back to Modesto
>
> Distance = 192.2 miles
>
> Ave. mph = 51.4
>
> DIC mileage = 22.4 mpg
>
> Leg #3 - Modesto to Madera CA - All highway miles.
>
> Mild to Wild Exhaust "open"
>
> Includes two WOT passes of a bunch of cars. 109 mph tops.
>
> Distance = 63.2 miles
>
> Ave. mph = 70.1
>
> DIC mileage = 25.1 mpg
>
> TRIP OVER
>
> Filled back up with gas.
>
> 357.2 miles divided by 16.548 gallons of gas = 21.58 miles per gallon
> average. ACTUAL.
>
> DIC Mileage average = 22.0*95.2/357.1 + 22.4*192.2/357.1 + 25.1*63.2/357.1
>
> = 22.37 miles per gallon
>
> DIC ERROR = (21.58 - 22.37)/21.58 * 100
>
> = 3.7% HIGH
>
> Conclusions: The DIC mileage is consistently higher than actual. The DIC
> mileage is a little high, but accurate enough. I still think you should
> occasionally check your mileage the old fashioned way to check accuracy. The
> flow sensor in this case was in new condition. The LS7 engine seems to get
> maximum mileage at 80 mph in cruise control. * Weather was cool and the oil
> only got up to 160 degrees F.
>
> Arnold, please do the actual calculation and report back. * If you are not
> capable, post your mileage and gallons used and we'll do the math for you..
>
> Ed

Speaking as a chemist, who's dad worked in the petroleum industry,
California gas is blended or cracked differently that other states. It
burns cleaner but contains less "energy" per unit volume
I've had 20% better mileage with Nevada's gas than our own.
Perhaps it's a conspiracy just so Sacramento collects more sales
tax?....K

Ken wrote:
> On Oct 12, 5:02 pm, "Spud" > wrote:
>> 2008 Z06
>>
>> 3000 total miles.
>>
>> New Mobil 1
>>
>> Tires @ 31 psi
>>
>> CITY DRIVING
>>
>> Includes numerous 0-80 mph WOT jaunts. I just can't help it.
>>
>> 61.5 miles divided by 6.086 gallons = 10.11 miles per gallon
>>
>> DIC mileage = 11.2
>>
>> Ave. speed = 18 mph
>>
>> DIC ERROR = (10.11 - 11.2)/10.11 * 100
>>
>> = 10.8% HIGH
>>
>> THE TRIP
>>
>> Trip was Fresno to Modesto CA two (2) times.
>>
>> Leg #1 - Fresno to Modesto
>>
>> Distance = 95.2 miles
>>
>> Ave. mph = 50.6 Includes 20 miles of getting out of and into town.
>>
>> DIC mileage = 22.0 mpg.
>>
>> Leg #2 - Modesto to Fresno and back to Modesto
>>
>> Distance = 192.2 miles
>>
>> Ave. mph = 51.4
>>
>> DIC mileage = 22.4 mpg
>>
>> Leg #3 - Modesto to Madera CA - All highway miles.
>>
>> Mild to Wild Exhaust "open"
>>
>> Includes two WOT passes of a bunch of cars. 109 mph tops.
>>
>> Distance = 63.2 miles
>>
>> Ave. mph = 70.1
>>
>> DIC mileage = 25.1 mpg
>>
>> TRIP OVER
>>
>> Filled back up with gas.
>>
>> 357.2 miles divided by 16.548 gallons of gas = 21.58 miles per gallon
>> average. ACTUAL.
>>
>> DIC Mileage average = 22.0*95.2/357.1 + 22.4*192.2/357.1 + 25.1*63.2/357.1
>>
>> = 22.37 miles per gallon
>>
>> DIC ERROR = (21.58 - 22.37)/21.58 * 100
>>
>> = 3.7% HIGH
>>
>> Conclusions: The DIC mileage is consistently higher than actual. The DIC
>> mileage is a little high, but accurate enough. I still think you should
>> occasionally check your mileage the old fashioned way to check accuracy. The
>> flow sensor in this case was in new condition. The LS7 engine seems to get
>> maximum mileage at 80 mph in cruise control. Weather was cool and the oil
>> only got up to 160 degrees F.
>>
>> Arnold, please do the actual calculation and report back. If you are not
>> capable, post your mileage and gallons used and we'll do the math for you.
>>
>> Ed
>
> Speaking as a chemist, who's dad worked in the petroleum industry,
> California gas is blended or cracked differently that other states. It
> burns cleaner but contains less "energy" per unit volume
> I've had 20% better mileage with Nevada's gas than our own.
> Perhaps it's a conspiracy just so Sacramento collects more sales
> tax?....K

The clean part is nice. The performance hit
finally went away (see Hib Halverson's fuel
discussion on the Idaho Corvette website <
http://www.idavette.net/hib/fuel/index.htm >
Problem was that it reduced California's yield
per barrel of crude.

Two or three years ago, Pres. Bush waived the
EPA requirement for Calif. blends. The yield
went back up but the air got dirtier. Showed up
particularly on trips from SoCal to Vegas -- air
out in the desert turned 'dirty-tan' when we
returned to 49-state gas.
--
pj

On Oct 19, 12:51*pm, pj > wrote:

> The clean part is nice. *The performance hit
> finally went away (see Hib Halverson's fuel
> discussion on the Idaho Corvette website <http://www.idavette.net/hib/fuel/index.htm>
> Problem was that it reduced California's yield
> per barrel of crude.
>
> Two or three years ago, Pres. Bush waived the
> EPA requirement for Calif. blends. *The yield
> went back up but the air got dirtier. *Showed up
> particularly on trips from SoCal to Vegas -- air
> out in the desert turned 'dirty-tan' when we
> returned to 49-state gas.
> --
> pj- Hide quoted text -
>
> - Show quoted text -

A GREAT ARTICLE..thanks..K