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Tried a couple and no gain either on the MPG front on power via a dyno test. A small gain may show up on an engine dyno, but I did not see it on the one engine I had on an engine dyno. Have read they MAY be a little more effective in very specific EFI designs, particularly those with small plenum volumes. One that I tried was on a V8 (chassis dyno), the other a large displacement inline six (on an engine dyno). They also may be more effective on the old throttle body EFI systems. Spend your money elsewhere is my advice.
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Jim Allen
The Frugal Four Wheeler and Farmer
My ultimate goal is not necessarily the highest mpg but to make my trucks more efficient configured as I need them.
Old Reliable '86 Ford F-250HD 4x4, 6.9L diesel
Red '00 Honda Accord Coupe, 3.0L V6, automatic
The Plugger '05 Ford F-150HD 4x4, Regular Cab, 8-ft bed, 8,200# GVW, 5.4L V8, automatic, 4.10:1 ratios, 285/70R-17D tires
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