Best tuner out there for Rangers right now is Fred at www.rogueperformance.com. He is awesome at tuning a Ranger. He uses the XCalibrator series.
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351w.
look for code on the ecm itself.
I met and talked with a guy today that has an 07' ranger with the same profile as my 08' has. He has spent 2 years trying to get the most performance and feul economy out of his rig as anybody I have talked to. Since he ownes a local parts house I'm gonna assume he knows his business. He get's 18-22 mpg. depending on driving location. The mod's he has chosen are as follows;
1. K&N FIPK cold air induction
2. Flo master exhaust. (cat back)
3. Performance programmer from Bama chips. (seems to be what everybody uses on 4.0's)
4. Royal purple full syn. oil in motor and ALL other cases.
5. 30 + pounds of cooler, beer, and ice up against the tailgate.
Not sure which did the job, but I'm looking into this!
I have an 87 bronco 2 with a 2.9. I port matched and polished my intake and intake runners, releived the valve bowels, and port matched the exhaust sides also. Gained 1000 RPM and alot of bottem end. It improved the milage about 3 miles per gallon
You must have gave it a good tune-up at the same time to get anything noticeable.
Big JIm