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Your saying a catch can will increase fuel milaege??
I agree with crainor. Most people don't do statistically significant studies with well controlled environment to prove that a mod increased MpG or power. Worse yet, if the measurement instrument is EVIC, the results cannot be trusted.
A higher flow filter is meaningless in a stock engine stock ECU; the engine will retard it's call for air to ensure a constant flow. You can remove the filter and see no difference. You must have a proper computer tune to call for more air.
A catch can COULD improve longevity, maybe, but it will not increase MPG.
Most mod claims are linked to salemen or those who purchased and trying to justify the expense. Yes these are generalizations, that apply to the average stock setup where someone is exploring bolt ons.
A bypass tuner is a great example. Many will claim they see EVIC MPG improvement but this is not real. The ECU computer is purposely fooled/hidden from extra gas delivered for the increased power, thus understating MPG.
Retrax claims my bed cover saves 10% in fuel. After 7800 miles, there is absolutely no difference in economy. None, as expected (I bought for function only).
There are no easy low dollar magic improvements to MPG improvement; if there were, the manufacture would have made them standard to improve competitiveness and get the Government off their backs.
Agree it's not the case that some bypass tuners intentionally fool the on board computer to increase MPG. It tricks the system to deliver more gas and with this process, the computer doesn't see the extra gas delivered. Remember that an EVIC type took is estimating gas volume, not measuring it (like a gas station), using parameters like number of injections, rpm, etc.
If you have that severe of a knock problem, I wonder about bad quality gas, high ethanol or other problems. But yes I can see how knock prevention can prevent a loss in HP, rather than a gain above stock figures.
I have extensive history of hand calc fugues on multiple brands. All the on board figure were high. Also remember that being close to actual hand calc can be luck. The computer doesn't track MPG over one full tank of miles. Only tracks the most recent ~209 miles. You can prove this to yourself by tracking EVIC frequently and see how ridiculously fast the MPG fugues can move up or down based on very recent changes in driving style.
My Mercedes and Infinitis had 10,000 miles before a K&N CAI install. The next 10,000 miles showed 0.0 difference in MPG, all hand calculated. I never miss a fill up when tracking. Butt dyno showed nothing, and to my initial frustration but knowledge gain, a dyno showed no more than 1-2 HP gain at super high unusable rpm. No use in normal everyday.