Who'da thunk that?

Hello. Newbie here. We've been experimenting with simple water vaporizer and electroyzer. DH's car is 97 Ford T-Bird. He's driving 100 miles per day work commute. So his is an excellent experiment. Wanted something simple and low cost to test so built simple electrolyzer by Ozzie w/ 316L stainless wire tower, bubbler, check valve, baking soda, distilled water, plugged line into air intake, wired to an old cell phone adaptor 12 v to plug into cig lighter to control off/on. Also, has the 2 cell system sitting in the back floorboard to tweak. NOte: DH is Very safety concious if anything sounds alarming. Builds scary things for a living.
Results:
Regular mileage 26 mpg - trip per day 100 miles, limited traffic. To get mileage - fill up, drive, fill up - divide miles by gallons on 2nd fill. (quick & dirty method)
1st day trial - 26 mpg - same as usual (100 miles limited traffic) (blows steam - 1 1/2 tsp baking soda - too much runs hot)
2nd day trial - 14 mpg - EGADS! but we're all excited - the HHO is doing SomethinG! (ride sharer scoffs - told you it wouldn't work!) backed off to 1/2 tsp baking soda - studies up on MAP sensor enhancers hoping for easy fix. Nah. Gotta have EFIE.
3rd day trial - unplugs electricity - uses only water/vaporizer -
52 MPG! with only WATER vapor!

We are stunned with disbelief. (Must be a mistake. Is there any way the guys are putting gas in your car? No.)
4th day trial - unplugged - 54 MPG. (ride sharer wants one for his truck.)
5th day trial - unplugged - 53 mpg - different driver, different direction.
Okay. We're

amazed/stunned and can't wait to see what HHO will do. But we're not car electrical people and gotta have EFIE. We've been stressing out over where to get, how to use/install and hunting everywhere for info, then Found you here and it doesn't seem so alien/scary to journey into resistors and sensors. Bless you all!
We cannot wait to read and share more info. This (HHO) is the most exciting thing I've seen in years: cars, lawnmowers, off grid houses - but I'm getting ahead of myself. We have about 20 folks breathing on us every night to get HHO in their cars. Currently 4 other test cars - all with only water vapor/no electricity for now with improvements in mileage. Will keep you posted. Also, ordering EFIEs.
Thank you so MUCH. Sorry to be so long.
LadyRebel