I don't have volanf but found to get good mileage at 66mph cruise which keeps on increasing the range vs 74mpg which is also the maximum speed that gives efficient mileage.

 

2nd Fill-Up after installing Volant was: 13.1 MPG, 100% City Driving, AC use, trilling to go light on the throttle, 87 Octane E10 from Exxon. This was about a quarter-tank fill-up, so not as accurate as full tank fill-up.

3rd Fill-Up after installing Volant was: 21.7 MPG, 5% City Driving, AC Use, carrying 4 passengers, some Highway Cruising 66 MPH, but quite a few hard acceleration passes, and average MPH around 72 MPH. This is the best MPG that I have gotten to date. Perhaps the Volant likes the highway best?

 

See my Fuelly link here:

http://www.fuelly.com/car/chevrolet/...doc5339/261531


I have done a total of 19 Fuel Fill-Ups since I got the Tahoe Hybrid. See breakdown:

OEM Air Box/Filter: Average of first 11 fill-ups=17.98 MPG

Volant Cold Air Intake/PowerCore Filter: Average of latest 8 fill-ups=17.59

Best MPG that I ever got (95% highway) was 23.94 MPG with the Volant CAI


I am debating whether or not to put the stock air box back on and sell the Volant.

Pros for the Volant:
-very good MPG on the highway
-GREAT engine sound, better throttle response (at least perceived as better)
-very long air filter service life

Cons against:
-does not seem to increase MPG in the city, and may actually hurt city MPG
-perceived increase in engine performance may promote more hard accelerations
-would probably sell Volant at a loss

Please feel free to attack or comment at will...

 

Thanks for the data.

 

Just did my 9th Fuel Fill-Up with the Volant: 95% City Driving, 15.26 MPG

 

I have about 40K miles on my Volant install and I have mixed feelings. At first I was certain it increased MPG, then I was certain it decreased MPG, now I just don't know.

Bottom line is there are too many other variables that come into play, the ambient temperature, ethanol adulterated gasoline, more miles on the vehicle, possibly worn spark plugs, Tire inflation, number of passengers, Etc. Etc. Etc.

One thing is for sure, under acceleration it is louder which can encourage pushing the gas pedal even more-lol.

I'm not certain I would install it again but it was an experiment.

 

I like the current hybrid because its very quiet. Was thinking of getting the new 2015 escalade but it was also loud compared to my current ride. So I don't know.

 

Last 12 fill-ups with Volant CAI installed: 16.69 MPG (average of 12, including one highway at 23.94 MPG)

Just removed the Volant and reinstalled the OEM Airbox. Can now say with some certainty that the Volant lowers MPG in mostly city driving.

 

WoW. Data trumps opinion.

 

Amazing how that works, isn't it.