sounds like BS to mo...
I availed of the the before and after test-drive ng aeronox the other day, walang noticeable power increase o "power-surge" whatsoever. Nakabara pa nga ng air-intake yung gadget. Siguro dahil newly overhauled yung diesel engine pati fuel pump ng van ko. baka it works or gives a noticeable improvement sa mga luma or worn-out engines.
mas maganda kung quantifiable yung result mo. not just basing it on the position of the fuel gauge.
do you know your actual consumption before you installed the device? and after you installed the device, how was it?
wala pa akong alam na gas saving device that actually works except changing the way you drive.