[SentraSE-R]

I've yet to see an ABA or scientifically controlled test proving any benefits (either power or fuel economy) from WAI or CAI. The most convincing testimonials come from long-term fuel logs showing possible mpg gains with WAI, but they're also linked to driver awareness and behavioral changes, and possibly caused by engine tune, ambient temperature, tire inflation, route changes, and myriad other factors.

It's impossible to see a CAI keeping rpms lower. Engines are coupled to tires by fixed gear ratios. If your engine spins 2200 rpm at 60 mph in top gear today, it's going to do it tomorrow, too. It's going to spin 2200 rpm at 60 mph climbing mountains in Alaska in the winter, or descending grades in Death Valley in the middle of August. GPH consumption and mpg will change, but rpms won't give you a clue to either.