Hypermiling the Chevy Tahoe 6.0L v8 40MPG! :O

[ksa8907]

My take on the Yukon hybrid is it is the best darn stop start system you can get. The vehicle can be driven on electric only for a short distance, very similar to the Prius, but generally runs the engine by 10mph from a stop.

Our Denali is 4wd, doesn't have any of the aero enhancements, and has the 22"wheels. We average about 19-21 mpg but it is still better than the 12/18 rating of the non-hybrid.

If you want better mileage from one of these, just slow down. By far the least efficient aspect is the aerodynamic load.

[fusion210]

Welcome! I've always wondered what these (GM SUV/Truck)s get! They can be tempting buys now.

Do you have any mods planned?

[Tahoe_Hybrid]

Originally Posted by fusion210

Welcome! I've always wondered what these (GM SUV/Truck)s get! They can be tempting buys now.

Do you have any mods planned?

Yes but I want to fix the air dam and fender (had some minor damage when i bought it)

that is how I got a 84,000 miles SUV cheap


someother guy on yukon forum bought a same hybrid tahoe 4*4 for the same price I paid with 200k miles



the HIGH speed starts EATS serpentine belts quickly through

it was all ready varnished and tearing it self apart after only 5k miles asit looks pretty new the paint in not even worn off (that shows the part # still)


you can hear the belt slipping upon 1500 RPM start up

glazed crack fray and slip. all of them... there is 5 cracks running all the way around the belt...


ticking time bomb tell it self destructs..

it has not effected cooling performance yet that is the only thing running on the belt system, other wise it's just 4 idlers and a water pump..


i bought a genuine goodyear Gator back NOS not the continental one..

[vskid3]

Impressive numbers from such a beast! What are your tank averages?

Originally Posted by Tahoe_Hybrid

120KW total (two 60kw motors 80hp)
the total combined output is 379HP 472 ft-lb Torque

The max power available from the battery is probably 20-30kw. I don't fully understand how the Tahoe's transmission/motors work, but if it's like the Prius, power is sometimes sent electrically from one motor to the other rather than through the transmission mechanically. That, and possibly being overbuilt for longevity, is why the motors are so powerful, not for EV mode.

[ksa8907]

Originally Posted by vskid3

Impressive numbers from such a beast! What are your tank averages?

The max power available from the battery is probably 20-30kw. I don't fully understand how the Tahoe's transmission/motors work, but if it's like the Prius, power is sometimes sent electrically from one motor to the other rather than through the transmission mechanically. That, and possibly being overbuilt for longevity, is why the motors are so powerful, not for EV mode.

I believe the limit is 60amps, so around 20kw depending on soc.

Edit: sorry, that's the limit to trigger the engine on.

[Tahoe_Hybrid]

Originally Posted by vskid3

Impressive numbers from such a beast! What are your tank averages?

I have not ran the tank down but i'm planing on a long trip 2,300 miles
so we can get some pretty 100% HIGHWAY numbers...

My goal is to use no more then 65 total gallons of fuel for the trip So i would need to average 35MPG it would cut my fuel costs down to less then $250 cheaper then a round trip plane ticket... I have a lot of my old stuff to pick up so i gotta to minimize my costs......

[mpg_numbers_guy]

Originally Posted by Tahoe_Hybrid

regen only works from braking or coasting or if you let the engine idle (according to the infotainment screen\)

Which means that you have to brake and/or idle the car (which both waste gas) to charge the battery. Otherwise the battery gets too low and then force charges, which increases fuel consumption.

In a hybrid, regenerative braking basically takes the gas you used to accelerate, and very inefficiently turns that into electricity when you brake. It's a very lossy process that's typically far less efficient than the standard gasoline motor by itself. That's why hybrids don't really get much better mileage for hypermilers, although they do help offset the inefficient driving style of the average driver.

Originally Posted by Tahoe_Hybrid

I have not ran the tank down but i'm planing on a long trip 2,300 miles
so we can get some pretty 100% HIGHWAY numbers...

My goal is to use no more then 65 total gallons of fuel for the trip So i would need to average 35MPG it would cut my fuel costs down to less then $250 cheaper then a round trip plane ticket... I have a lot of my old stuff to pick up so i gotta to minimize my costs......

Highway trips are good indicators of fuel economy if you can go through a full tank. I'm sure a lot of us would like to see some at-the-pump calculations to confirm the fuel economy of the Tahoe Hybrid. Some numbers on full tanks with average driving that includes around town driving would be helpful as well. Steady state cruise isn't as good of an indicator of efficiency. For example, I can typically cruise at 120-140 MPG at 35 MPH in my Insight during the summer, but have never gotten a full tank over 100 MPG.

[Tahoe_Hybrid]

Originally Posted by mpg_numbers_guy

Which means that you have to brake and/or idle the car (which both waste gas) to charge the battery. Otherwise the battery gets too low and then force charges, which increases fuel consumption.

In a hybrid, regenerative braking basically takes the gas you used to accelerate, and very inefficiently turns that into electricity when you brake. It's a very lossy process that's typically far less efficient than the standard gasoline motor by itself. That's why hybrids don't really get much better mileage for hypermilers, although they do help offset the inefficient driving style of the average driver.



Highway trips are good indicators of fuel economy if you can go through a full tank. I'm sure a lot of us would like to see some at-the-pump calculations to confirm the fuel economy of the Tahoe Hybrid. Some numbers on full tanks with average driving that includes around town driving would be helpful as well. Steady state cruise isn't as good of an indicator of efficiency. For example, I can typically cruise at 120-140 MPG at 35 MPH in my Insight during the summer, but have never gotten a full tank over 100 MPG.

25mpg was my last combined fill up...... it's still way better then the normal 5.3L non hybrid those 5.3L barely see 12-15mpg..

I just hate the fact GM leaves then engine going on down hills


I'll be replacing the air filter as well as it's clogged Just waiting on the part i need (the torx tool to open it)

[mpg_numbers_guy]

25 MPG is really good for such a large vehicle.

I wonder if the engine is actually "running" (i.e., consuming gas) or in some sort of DFCO mode like traditional gasoline cars have, where if the RPMs are above a certain number and your foot is off the gas, it cuts off fuel to the injectors while still leaving the engine "on". In that case the resistance of the engine spinning would add some sort of charge to your hybrid battery without actually consuming any gas.

[Tahoe_Hybrid]

Originally Posted by mpg_numbers_guy

25 MPG is really good for such a large vehicle.

I wonder if the engine is actually "running" (i.e., consuming gas) or in some sort of DFCO mode like traditional gasoline cars have, where if the RPMs are above a certain number and your foot is off the gas, it cuts off fuel to the injectors while still leaving the engine "on". In that case the resistance of the engine spinning would add some sort of charge to your hybrid battery without actually consuming any gas.

Yes it enters Regeneration Mode...

sure it running Lean since the MAP drops to "normal idle" levels

i'lll be doing a windows up and A/C on (Electric A/C) it draws about 5-6KW it's a industrial compressor 330v 3 phase ..


a lot of places claim it uses more fuel , way more fuel but i don't think so.. they claim more then 25%(at lest the stupid EPA says)

it cycles like the normal one in a house as well I have the temp set to 60F Very high fan level then drop it to low-medium level. once it gets to a comfortable level...(it gets there very fast with in a few min)


plus next week we will be able to see New VS old air filter results...