[magnuman]

These intake tests have taken several months to complete, but here are my results from this last phase (Phase 4), as well as my opinions (for what they're worth), and observations. I'll summarize by including results from each phase so you can see, in a nut shell, how the various configurations worked. Also, the highway driving for this phase was two long trips of about 1500 miles each. To see how and why I did these tests, You can refer to the previous phases of this exercise at:
http://www.300cforums.com/forums/showthread.php?t=7227
http://www.300cforums.com/forums/showthread.php?t=8541

Notes: Inbound highway for Phases 3-4 there were moderate head/cross winds.
Also, Phases Three and Four the ambient temperatures had risen sometimes to as high as 105 degrees, with very low (15-25%) humidity. The highway tests for Phase Four were in altitudes from 290-7000 ft. elevation.

Phase One-Stock everything
In Town, 15.3 and 16.1 for an average of 15.7 mpg
Highway, outbound, 26.7, inbound 28.5 for an average of 27.6 mpg
Phase Two-K and N drop in filter
In Town,17.1 and 16.8 for average of 16.95 mpg.
Highway, outbound 27.1, inbound 25.7 for an average of 25.7 mpg
Phase Three-K and N drop in filter and additional duct from grill to airbox.
In Town, 17.7 and 18.1 for an average of 17.9 mpg
Highway, outbound 29.1, inbound, 25.4 for an average of 27.25
Phase Four-K and N, additional duct, and double wall, triple insulated intake.
In Town, 15.9 and 16.4 for an average of 16.15 mpg.
Highway, first trip 1521 miles, 25.22 mpg overall. Best tank was 446 miles on 16 gallons, for average of 27.87 mpg. Best leg was 178 miles, 30.3 mpg.
Highway, second trip 1446 miles, 24.55 mpg overall. Best tank was 438 miles on 16.1 gallons for and average of 27.08 mpg. Best leg was 132 miles, 27.5 mpg.

Comments/Observations: Installing the K and N and the additional 3 inch duct seems to be the best and easiest mods. to do. The insulated duct in Phase 4 only cools the intake air slightly more than the stock system on the highway. In town the insulated duct runs cooler inlet air and recovers quicker, but as you can see did not render the best mileage. Ambient temperatures 95-100, with 15-25% humidity may have been a factor. I will also say that on the best tank (446 miles/16.0 gallons) and best leg of the first trip (30.3 mpg) were obtained using regular (87) fuel with 7 oz. of acetone added to the fuel. Best mileage was obtained at about 4500 ft. elevation.
--If I were doing this over, and drove mostly on the highway, I'd do the first two mods. only. (K and N and additional inlet to airbox)
--If most of my driving was in town, I'd do them all again.
--Weather conditions and speeds driven have more to do with gas mileage than any of these mods.
--Acetone does do some good on the highway with my vehicle. City???
--Bottom line, as proven before....the stock system isn't too bad at all, but with the high prices of fuel these days, every little bit helps, IMO.

 

[Meister]

These intake tests have taken several months to complete, but here are my results from this last phase (Phase 4), as well as my opinions (for what they're worth), and observations.

Nice work, magnuman. And every little bit does, indeed, help.

 

[JustForFun]

What speeds you driving on the highway to get those mpgs??

JFF

 

[magnuman]

JFF.
For Phases 1-3 the highway driving was a 260 mile round trip run, and was done at speeds from 60-70 with a couple full throttle runs in each direction. Outbound I drove 65-70 mph, and inbound on the same highway, I drove 60-65 mph. For Phase 3 I reversed the speeds...60-65 outbound and 65-70 inbound. Ambient air temps. ran from about 55-75 degrees. Highway driving was all done in rolling hills at altitudes of 2600-4200 ft. elevation. For Phase 4, the first trip was 1521 miles driven mostly between 55-70 mph. The second trip (family emergency) was 1446 miles and driven between 55-85 mph. Gas mileages included all in-town driving (54 miles on first trip and only 14 miles on the second trip). Altitudes for the first ranged from 290-7000 ft. and the second ranged from about 2800-5000 ft. Ambient temps. for both ranged from 90-105 degrees. The total miles driven for all phases of this test was just over 3500. I think this was a pretty good sampling under a wide variety of conditions. I do know that in the winter (cooler/denser air) the mileage is better. Also, I live at 2800 ft. and normally always run regular (87) gasoline, which tends to give me better mileage than mid-grade (89).

 

[rogue]

JFF.
For Phases 1-3 the highway driving was a 260 mile round trip run, and was done at speeds from 60-70 with a couple full throttle runs in each direction. Outbound I drove 65-70 mph, and inbound on the same highway, I drove 60-65 mph.

Are these MPG figures coming from your EVIC or from you calculating your miles from the 19 gallon tank until its completely empty.

If you are basing the figures on your EVIC, I suggest you calculate it the old fashioned way, you might be incredibly shocked.

 

[eudaman]

i dont think i could depress the pedal softly enough for that type of MPG....the best ive ever done using cruise control the entire way is about 21 mpg from OC to SD and back...with a small amount of intown SD driving. i had CC at about 80.

 

[magnuman]

rogue,
I am afraid I am already doing it the old fashioned way...with a fill-up before and after...and a calculator. I do it this way every time I get gas...carry the calculator in the glove box. Also, the farthest off I've ever seen my EVIC is 4 tenths of a mile per gallon. On the long trips in Phase 4, first trip, 1521 miles on 60.3 gallons ($150); second trip 1446 miles on 58.9 gallons ($152.25). Am I not figuring it correctly?