Mine is an Alpha and I have the Flexfuel logo on the tailgate....but I haven't noticed it on the I5 models. Is the Alpha the only one that has the Flexfuel technology?
Anyone else have it, and does it do anything substantial?

 

Flexfuel can only be used in the 2010 Alpha's. I have not used it yet for 2 reasons. First you don't get as much bang for your buck. ( Less MPG's) and there are no gasohol stations in my area. In fact I have never seen one. I don't get out much...

 

+++++1

 

Yes sir only the 2010 alpha features the flexfuel logo with the active Fuel management which turns 4 cilinders off at light highway speeds, and is also capable of using e85 which i have never seen anywhere i believe it is used in south america; brazil and its neightboors

As a matter of fact my dad drives a 5.3 single cab and my mom a suburban flexfuel both 4x4s and at 220 miles my dad has to fill up while mom still has 1/4 tank even thogh hers is way heavier, that is really awsome imo. I did half the same run they do, bought my 2010 t flexfuel at this city, filled it up and i did return with over half tank, so i believe its just a notch under the suburvan 07 but definitely not as bad as the chayenne 07 single cab

 

GM 5.3L Liter V8 Vortec LMG Engine Info, Power, Specs, Wiki | GM Authority
That proves the Active Fuel Management which i repeat its awsome

 

GM 5.3L Liter V8 Vortec LMG Engine Info, Power, Specs, Wiki | GM Authority

Google 5.3 flexfuel the firsts webs its a wikipedea web readthat i cant paste itfor some odd reason... Im on iphone

 

By the way mine has a sticker by the door latch, next to the tire pressure stickers i belive, and it says "use only premium gasoline" so 93 octane would be it. I just ignore it.... Seems stupid filling a truck on premium gas, i just go by regular 83 octane. So does my mom she bought it new and shesgot ove 100,000 no problems on regular

 

The LH9 V8 in the 2010 H3/H3Ts does NOT have any cylinder delete systems.

 

Holy cow its the 3rd time i write this and keeps bugging.....
"LH8 Edit
The Vortec 5300 LH8 is a variant of the 5.3 L Gen IV small block V8 modified to fit in the engine bay of the GMT 345 SUV and GMT 355 trucks. It produces 300 hp (220 kW) at 5200 rpm and 320 lb·ft (434 N·m) at 4000 rpm. It has a displacement of 5,328 cc (325.1 cu in).[14]

LH8 applications:

2008–2010 Hummer H3 Alpha
2009–2012 Chevrolet Colorado/GMC
The Generation IV Vortec 5300 engines are truck engines that share all the improvements and refinements found in other Generation IV engines. At present, four versions of the 5300 are in production: two iron block versions (LY5 and LMG) and two aluminum block versions (LH6 and LC9). All versions feature the Active Fuel Management system, and starting with MY 2010, variable valve timing (engine RPO codes stayed the same)."

From

https://en.m.wikipedia.org/wiki/GM_small-block_engine

My moms' 07 suburban 4x4(heavy) gets many more miles than my dads' 07 single cab chayenne z71(light truck)

Correct me if im wrong, but you have to use a nonflexfuel and a flexfuel to see the difference, im sure my dads' MPGs its on pair with my 05 ram hemi!

 

Once again read. No VVT on the 2010 Alpha.

Try to find one made anywhere near May of 2010.