Yes, direct injection can definitely cause problems, as I learned when my son's 2015 Fit had fuel system problems. Fortunately, his car was totaled before he had to spend more money for new injectors ($1,700). There are fuel system cleaners you can use. Sea Foam is one, and CRC makes another. The cans hook right into the fuel intake.

 

I don't think seafoam or CRC is going to make any difference if the injectors are flawed..

 

The issue is the fuel no longer washes the areas that have significant, early buildup due to the GDI designs. The injectors are pointing away from most of the valve underbody (compression side) and no gas/air mixture gets to the top of the valve on the intake side. My bet from eading a ton on GDI before purchasing my car is that I'll ahve to follow the Tubo/Diesel communities solution of removing the intake at 60-100K miles and having it soaked or replaced (since it is *plastic*). The valvetrain's another matter.

From Honda:

2015 Honda Fit - Powertrains

Overview
In keeping with Honda’s mission, to provide both fuel efficiency and fun-to-drive at a high level, the 2015 Fit is powered by an all-new Earth Dreams Technology 1.5-liter engine paired with either a new six-speed manual transmission (6MT) or a new Continuously Variable Transmission (CVT). A program of weight saving, friction reduction, technology application and clever engineering resulted in an 11 percent increase in horsepower to 130, and a 7.5 percent increase in torque to 114 lb-ft over the previous Fit’s engine. A similar approach produced transmissions that help provide quicker acceleration, smoother shifting and class-leading EPA fuel-economy ratings of 29/37/32 (city/highway/combined)1 for manual transmission models, 33/41/36 for the LX trim with CVT and 32/38/35 for the EX and EX-L trims with CVT.

Key New Powertrain Features

• Engine
  • i-VTEC® (intelligent Variable Valve Timing and Lift Electronic Control) for intake valves with Variable Timing Control (VTC)
  • Computer-controlled direct injection (DI) with multi-hole fuel injectors
  • All-plastic intake manifold
  • Lower friction
  • Reduced weight of moving parts
  • Valve diameter increase, decreased plug diameter
  • Improved cylinder/piston cooling
  • 100,000 +/- miles tune-up interval

 

I don't know either. Here are a couple of videos.

 

I never thought I'd ever see someone say in 1 sentence "fortunately" and "his car was totaled" .... lol

 

Yes, I know. : )

It had almost 89,000 miles on it, and it would have needed $1,700 in new injectors - at least. It took the dealer two months, while my son spent $750, just to get it to pass state inspection. Then the warning lights came back on.

 

How much on average do you add in gas after the gas tank tops off (by the pump kickoff). I'm on my fourth fill up and it looks like I can consistently add an additional 1.3 gallons of gas after the pump kicks off. Should I start using that as my baseline for getting more consistent mpg measures?

 

About a year ago I filled my tank right up to the top, drove home and parked the car in the garage for two days. After the two days I took a gas can and added more fuel to bring the level back up to the top where I could see it. Almost a gallon. I was surprised that I was able to add so much to a supposedly absolutely full tank. Possibilities:
1. Gas was warm and the volume shrank as it cooled off over time.
2. Air mixed in with the gas when it was originally poured at the pump and this dissipated as the car rested, dropping the gas level
3. The ground around the pump wasn't level (common around here) and the car was actually leaning slightly forward or backwards or sideways leaving an air pocket in the tank which couldn't fill up with gas.

Since thinking about this simply gave me a headache I decided to simply take the Fits estimate of fuel economy and be satisfied with that. It may be inaccurate as some claim but at least it should be consistently inaccurate from trip to trip. I no longer have a lot of confidence in pump measurements .

 

I add one "Click" from the gas pump.

 

I also “worry” about overadding from a filler neck rubber seal standpoint. The filler neck seal was never meant to be fully submerged and I’m not sure how the tank and environmental breather systems in the GK fit work when the tank is overfilled. I think I’ll stick to that safe 1.3 gallons over pump kickoff for now.

 

On my 2001 Civic, I used to fill one-click past the nozzle clicking off until that time I heard a second "click" from under the car.

Uh oh.

The force of the extra fuel pulse had separated the fuel neck from the tank. I needed to replace the entire fuel tank, about $800.

Now I choose the slowest fill rate (if there's a hands-free latch for that) and let it shut off on its own, and don't worry about stuffing the filler. This also saves a couple of seconds at every fill.

I use those saved seconds for a trick I learned in high school some 40 years ago. I shut off the pump (tap the nozzle flap door, or on older pumps, lower the pump nozzle handle to off), then give the pump nozzle a squeeze. A few ounces of fuel (I estimate between 1-2 cups) will shoot out, just from the residual pressure in the hose. I figure that I fuel each car about 70 times per year, which at just one cup of per fill adds up to about 5 gallons of recovered fuel or $15/year per car.

Whether this has been worth suffering two decades of derision from wife and children (as in "you're such a skinflint, I can't believe you make me do this") will be a separate topic. Nonetheless, it is satisfying to shut off the pump, squeeze the nozzle valve, and get a whoosh of free gas. If you back the nozzle out to just inside the nozzle hole, you can see the gush for yourself.

---

I do miss the extra 2-3 gallons of capacity the CIvic had over the Fits. On road trips, this means that I have be more vigilant to avoid landing on empty in a pricey area. A small consolation is that the Fit fills up in about half the time needed by the big guzzlers with 20+ gallon tanks. . More than once I've seen drivers of those vehicles give me a "you're done already?" look when I stow the nozzle and drive off.

 

[QUOTE=wistlo;1434521... a trick I learned in high school some 40 years ago. I shut off the pump (tap the nozzle flap door, or on older pumps, lower the pump nozzle handle to off), then give the pump nozzle a squeeze. A few ounces of fuel (I estimate between 1-2 cups) will shoot out, just from the residual pressure in the hose. I figure that I fuel each car about 70 times per year, which at just one cup of per fill adds up to about 5 gallons of recovered fuel or $15/year per car.[/QUOTE]

I'd love to see your reaction as you're waiting on line for a fill-up, and the guy ahead of you does that trick to get extra gas out of the hose. You would have gotten the gas that he sneaked into his tank. I've heard of that trick, but I've never tried it. Maybe next time.

 

I never thought about it, but in all these years and across 2/3 of the country, I have never noticed anyone else doing the shutoff trick. Try it, you'll be surprised how much fuel gushes out. It's best done when you're standing right by the pump. Too much walking back and forth, otherwise.

 

So far after 1300 miles on my 2019 LX, I’m averaging 41 mpg using all of those miles divided by all of that gas used. That’s 92% of what the car indicates. So a good rule is that the gauge is high by 3-4 mpg. I drive conservatively and have only about 10% of those miles driven in city conditions.

 

Beat this (you can't; it's capped).



Coming down Cadillac Mountain in Acadia National Park.

 

Not bad at all. : )

 

I was just there two weekends ago (White GK fit). Pictures? Here's one of mine taken 22 August 19 at a roadside walk:

 

Breathtaking, isn't it?

 

Yes the South face of Cadillac is breathtaking. I feel privileged to be able to go up and back on that trail in one day. The previous time I was there was 1995.

 

18 sport cvt
been constantly getting 35-37 mpg.. with Econ mode on with d drive. I consider my driving style as very conservative. I think this is pretty crappy. I think the 1.5 I Vtec should do better than this.
It is mostly freeway with some traffic.