Yep am personally completely amazed.

I never really kept close eye on the mileage on my car before or after the FD install 10 years ago. But recently had to put the car back on the road so I can put the EVO in the shop, and after putting up with between 18 and 24 average MPG with my EVO I am completely pleasantly surprised that my R turned 35 MPG for a weeks worth of commuting, which included loads of VtaK and Redline shifts and speeds around 75 MPH. Am on 215/50/15 tires as well, not that that has much to do with it but thought I'd throw it in for specs.

Wow, just Wow, am very glad that visceral fun also can provide some good mileage numbers...

 

Excellent! I noticed a MPG jump going from a 4.4 to a 4.785 on the highway.

 

WTF I must drive crazy, I only get like 27-28 basicly stock itr

 

if it's a stock p73 ecu try a heat range 6 plug. adds about 2mpg over a 7

mpg will always be better on a tuned car like i suspect the above is. honda made the oe ecu a bit rich and was lax with mid throttle timing

 

lol i get worse average 23-25mpg for a jdm 98spec swap with the 4.7fd, i really need to get off the jdm p73 ecu lol

decent amount of city and highway say 60%city 40% hwy. loads of vtecing everyday lol.

 

heat 6 plugs seriously help a jdm p73. you'll get 2-3mpg over a 7, other place you can look is the air filter. high flowing and clean.

i've actually seen as much as 570km off of a single tank in a jdm itr with step 6 plugs. with 7s the same car would get 470-500km

 

Yeah I have a new aem cold air intake. I think ill try the heat 6 plugs soon, I'm running some. Ngk irdiums series 7 now. I still think the jdm p73 is running way to rich anyways, probably end up getting a chipped ecu and tuning it for my needs.

 

I believe it.


On the way to Expo this year I pulled off 35mpg's twice. I have a JDM 4.7FD, front splitter and Mugen gen2 wing set at full downforce. The sweet spot for gas mileage seemed to be around 4700rpm.

I'm gonna throw this out there too. I have noticed while driving hybrids and the newer cars with instant mpg displays in the dash that 4cyl motors like to be revved for optimal mileage. I noticed that there where times that 4th gear on the highway was better than 5th gear. It didnt make sense to me. I noticed that when the 4cyls (hybrid and conventional) would fall below 3k rpms (or somewhere close too) the gas mileage decreased. Above 4k rpms they always got progressively better as it rose. Continuing that, the upper rpms around 5700 seemed to be the point where it starts decreasing again in mileage.
Not scientific by any means but I would be curious if anybody else has ever experienced this or if this even makes sense.

 

I always had a hunch about that. I noticed that if I was accelerating slowly, say about 30% throttle, the engine wanted to keep winding out before power wanted to drop off. If I simply kept reving with my foot in the same position until I felt the torque start to drop off, I would get much better mpgs. Of course this would usually take to about 4k rpm or more.

I guess it all makes sense though. Higher gear means greater load. Greater load means richer a/f mixture. That could easily counteract the sometimes minor drop in revs (say 4th to 5th @ 40mph). You just have to find the right balance between rpm and gear.

This also why I think it's important to down-shift for hills to save gas. You don't have to accelerate, but you do want to keep in an efficient section of the power band to maintain speed.

 

With a 4.9 final I am getting 30 city and 34 highway using the NGK Iridium heat range 6 plugs on the stock P73 ECU. My plugs are a little more white than my liking though which is keeping me from putting on my TODA header because it will lean it out a little more than the JDM 4-1. With my compression being 11.1:1 I probably should use the NGK Iridium heat range 7 plugs I have lol.

 

either one works but 7s increase the black soot on the bumper and decrease mpg. they are however more detonation resistant and would be what i ran for a HPDE day during the summer

 

gotcha, I might throw the 7's in and check to see how they look. Run a tank full through and check my MPG against the 6's.

 

i got 400km out of 20 L gas on highway
that's 47 mpg :D
but my car was tuned on 94 octane and when i got 47 mpg i was running 91 + some octane booster + some more 94 mix it is weird.
and when i go back to 94 octane its not as good. i get city/hwy combined at 32 mpg
and i also have 4.9 FD

 

Stock R...380 miles on my last full tank b4 the gas light even came on!!! WOW!!!!

 

Correct me if I'm wrong but wouldn't a stock US spec ITR I/H/E tuned on S300 still get better MPG with a 4.9 F/D? Just seems the throttle angle (engine load) would have more to do with it than RPM.

 

over 600 km on a full tank here, light wasnt even on. Tuned p28 in mine

 

If you used the whole entire tank worth a gas wouldn't that only be 28MPG though? Does your gas light work? I believe the light comes on with 3 gallons left so given your light does work that's at least 36MPG

 

What other car can give this kind of performance and still get great gas mileage? If I decide to go back on an NA motor this is more than likely what I'll do.

 

Don't be mad at your evo for the bad mileage. My E85 evo is getting 11-13 mpg and I love every minute of it :D

 

When I first saw that the thread was started by Anton, I thought it's one of those from 10 years ago that some random people just brought it back from dead.

Good to see that you're still around!

 

no way, it's around 1.5gal, the car only has a 13gal tank and i've put 11.5 in it on fill ups a couple of times

 

The tank is 13.2 gallons IIRC, I saw somewhere that the low fuel light was at 3 gallons which seemed like a lot left to me but I wouldn't know personally as I have gone down to 1 gallon left before and never had a light come on lol.

 

Just put in my NGK R Iriway 7 plugs, maybe it is just me but it feels like it runs a little smoother. Now to drive and figure out the mileage difference if any.

 

oh yeah i forgot to mention i have LS 5th gear.. it revs 600 rpm lower than stock itr 5th gear :D. i used to hate driving my car on highway with stock 5th gear. i used to do 5000-6000 rpm the whole time. i almost need ear plug .. not anymore with ls 5th gear :D
i would have got 800 km out of 40L gas on mixed gas.

 

yep light is working, stock tranny and ngk 7 plugs