A "chip" tuned for max HP will not increase your MPG, but a retune or chip tuned for higher AFR (how much higher I have not explored with the FIT) will lean the car out at cruising speeds and minimum/partial throttle, thus wider throttle position minimizing pumping losses and hopefully returning better MPG. A warm air intake would have the same effect but decrease overall power for the Fit.

But as was said.... you'd have to calculate the return on your investment (how much MPG better) vs. the cost of the chip or retune. Most likely not worth it. (this is speaking in a general sense, I come from the EVO world and am relatively new to the Fit and don't aim to mod mine.)

 

My numbers come from my Fuelly.com uploads. You can download the fillup data and them import it into excel and do whatcha like with it I just made a simple graph.

I suppose everyone has a comfort zone on where to inflate their tires, but it's an opinion and for me, I am fine at 50 psi with my particular tire combos. Heck, if we were so worried about safety, we'd all ditch the LRR tires that come stock with the Fit and buy sticky summer tires in the summer and gummy winter tires in the winter...but not everyone does that.

LRR tires are very, very stiff as is. It takes a LOT of PSI to measure a difference in contact patch w/ these types of tires. I'd like to have another Fit owner come over and compare their Fit with mine and try to measure a difference.

As for the MPG benefits not being realized with higher PSI, I invite you to go over to Ecomodder.com or any hypermiling forum and state your opinion. I think you'd have a lot of opposition from others (with data mind you, they tend to be the obsessive type. ). In fact I did not run fully 50 PSI in my Fit from day one (that would be crazy to jack it up from the get go without feeling out the car's handling characteristics). I increased it over time and I experienced the difference in my recorded MPG (of course my MPG varied as my driving did and stuff I carted around).

specboy, your techniques are common sense, as are a lot of the HM stuff. But I wonder what MPG I'd get in VT, vs. an hour outside of NYC. *drool*

And I drive 50mph on 55mph indicated highways. On 65mph highways I'll do 55mph, maybe 60 if I'm in a rush. It's legal in all aspects and I'm safer than 99% of drivers as I'm not texting, not slicing and dicing through lanes and staying in the right lane keeping to myself. Fortunately/Happily, it's worked for a very long time.

My MPG is calculated, not done by the computer. I just had the computer reflashed for the MPG meter TSB and sadly, it probably will still be quite a ways off.

It's interesting....someone recommended installing a small block of wood under the throttle to prevent full throttle and I think that's just INSANE. haha. (I hardly ever use full throttle, but for safety's sake while merging or avoiding someone coming into my lane, it is a nice "safety feature" to have.)

Don't spill the water app sounds pretty cool. I should get it for my lead-footed GF as she has a smartphone. I have used that analogy b4, but no luck.