[AT] off topic, Internet takeover by govt ?(now GM 5300)

[Steve W.]

Ron,
  If it's a flex fuel and the mileage drops a lot with E85, I would bet 
the fuel composition sensor is contaminated. It basically checks the 
fuel for booze content and tells the PCM to switch programming curves to 
suit the amount of alcohol in the fuel. If it is bad it will cause lower 
mileage overall and a larger drop when using E-85.

The bad news is, those sensors are $$$$$$$$ for the factory version 
($400.00 for the one in the Sub).

There is a couple outfits that sell a "replacement" for much less, never 
tried one though.
http://paceperformance.com/i-10801493-13577429-fuel-composition-flex-fuel-sensor-e85.html



Ron Cook wrote:
> Charlie,
>      I have several friends that swear by their 5300 engines and talk 
> much like you are.  However all of them are newer than the '04 flex fuel 
> engine like I have.   That flex fuel business probably has it de-tuned 
> ?  Fuel mileage is around 17 max, whereas my 1997 5.7 Tahoe stays right 
> at 18 all the time.  The Tahoe probably is a little lighter but wouldn't 
> be much.  One of my nephews that has driven the Suburban probably more 
> than I says to put E85 in it if you want to see poor fuel mileage.  I 
> might someday just for giggles.
>      I took that Suburban for a couple reasons.  (1)  I always wanted 
> one but couldn't afford it.  I inherited zero from my dad while he left 
> everything to one 1/2 brother that stayed on the farm and never had a 
> job other than being a yes man.  He is now a multi millionaire.  So I 
> had no problems taking it.  (2)  I figured at my age, 71, that a nice 
> vehicle like that would see me to the end of my driving days.  I have 
> never been so disappointed in a vehicle.  It is pretty, though.  I am 
> sure it will be moving along to a new owner one of these days.  I can 
> see where supporting it could get very expensive.
> Ron Cook
> Salix, IA
> On 2/6/2015 2:02 PM, charlie hill wrote:
>> Ron,  I've been tickled pink with the 5.3 in my Crew Cab 4WD Sierra.
>> It's got a boat load of power, cruises the highway at 60 mph in OD
>> with the tack showing about 1700 rpm and gets on average all around
>> driving about 17 mpg.  On the highway at speeds below 75 it gets around
>> 20 mpg.  I actually like it better than the 5.7's I've had.  I agree with
>> you
>> that torque makes power and there is no substitution for cubic inches but
>> I'm fine with my 5.3.   I know a guy that has a 2011 GMC crew cab 4wd
>> that he special ordered with the 6.2 gas engine.  It's got a ton of power
>> but he has plenty of money and doesn't drive that far so gas mileage is
>> of no concern to him.
>>
>> Charlie
>>
> 
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-- 
Steve W.