First Tank = 16.5mpg
Last Tank = 15.5mpg

Pre-REVi average = 18.5 mpg

Mixed driving, Driving 'normal' most of the day, with one or three WOT-to-redline runs per day, in gears 1 and 2.

Doesn't really matter as long as you are having fun, right? :)

How weird... well, what he said^

Is it possible you are getting more air into the car and the ecu is dumping more fuel to adjust? When I installed mine I reset the ecu and found the milage was a bit worse after doing that but it works its way back up there.

i assume you've fixed the idle issue dmp?

It's probably because you're stomping on the peddle more to test the Revi...

i assume you've fixed the idle issue dmp?


Nope...still there. :( car drops to ~500rpms, studders heavily, and feels like it's about to die...about once every 10? seconds while at idle.

:(

If the damn TB just had an 'idle screw' like every OTHER car i've owned, I'd bump the idle to 1000 and just leave it.

It's probably because you're stomping on the peddle more to test the Revi...

I drive it +/- how I did before - I'm hoping things will level out eventually.

Things will level out eventually. My first tank after the REVi was 13mpg! from 18mpg! After a few weeks I am now getting 18-19. The tone of my box also mellowed a bit from a hollow roaring sound to just a deeper sounding stock engine.

Thanks Ishu :) I appreciate the encouragement :D

I had a problem with mine not idling correctly. Took it in and it turned out the "neutral switch" was bad. Apparently the wiring harness had rubbed through and shorted out the switch which affects the idling when the trans is in neutral (I have the manual trans). They replaced it under warranty which fixed the idling issue. Now I have the issue with what appears to be pinging but I think the plugs need replacing; I have just over 37k miles on the original set. All this made itself apparent after I had installed the CAI; I already had the REVi and RB exhaust.

I had a problem with mine not idling correctly. Took it in and it turned out the "neutral switch" was bad.

Yeah, that is relatively common problem. Exhaust heat is generally the cause.

Temp this time of year really kicks the shit out of the mileage. Mine has dropped about 30 miles per tank....I have a record of every tank since new...and the Revi didn't affect the #'s in any significant way...the temp does :D:

Mine has dropped about 30 miles per tank....
:Eyecrazy: What, at 150 mph? in first gear? Or do you have a 1/2 gallon tank?

:Eyecrazy: What, at 150 mph? in first gear? Or do you have a 1/2 gallon tank?


He's saying he gets 30 fewer miles per tank, not he only gets 30 miles per tank. ;)

^^That's what I love about internet forums :rolleyes:

Common sense is not common!

who needs common sense when you have psuedo-anonymity :)

while i haven't changed my intake (or anything), i've noticed that my last 2 tanks have been 1-2 mpg less than usual. so i guess its the weather...or the fuel blend...does the SE get a winter fuel blend?

I have been told since I can remember that I have no common sence. But I am not common.

Oh, BTW I understand the whole drop in mileage now. :slap:

After I installed my intake, I noticed that my mileage stayed about the same... but my driving had changed. It included a lot more WOT and 9,000 rpm just to hear the sound. It definitely had a positive effect. :D:

After 4 tank-fulls... a whopping 16mpg - down 3mpg from 'normal'. :( I'm not on the gas much more than before...still scratching my head as to the cause of the drop-off.

Try putting back the stock intake for a few tanks and see if your mileage goes back to the earlier level. It will be an interesting test.

I don't know how can you get that much worse gas mileage... mine went a bit up after installing the REVi. Not drastically, just about 1 mpg.

Perhaps this drop has to do with the weather more than anything else?
Still, 3 mpg difference is too much to be just because of that. Hm.

dmp,

I've noticed a sudden decrease of 20-30 miles per tank, so about 1-2 mpg, since about a month ago. All mileage sensitive factors have remained constant: no changes to the car (bone stock) and driving style, city/highway mix etc. hasn't changed.

I attribute it to the introduction of oxygenated gas for the winter. I expect to see it back up to normal in the Spring.

I don't wanna go thru the trouble of re-installing the stock intake actually...I'll just live with it, and take my chances on spring bringing better economy.

Maybe the tire pressure is down due to the cold weather. From what I have read/heard, tires pressure affects fuel consumption by a big margin.

dmp,

I've noticed a sudden decrease of 20-30 miles per tank, so about 1-2 mpg, since about a month ago. All mileage sensitive factors have remained constant: no changes to the car (bone stock) and driving style, city/highway mix etc. hasn't changed.

I attribute it to the introduction of oxygenated gas for the winter. I expect to see it back up to normal in the Spring.
Oxygenated gas will impact your gas mileage 10 to 20%.

this is just the reverse effect of when everyone was installing their units in spring and suddenly getting 2 more mpg.... when in reality they were just switching from winter fuels to summer fuels -shrug-

It wasn't until I installed the RB CAI that I experienced the drop in mileage; about 2mpg. I already had the REVi which improved mileage and performance. I was not expected a loss by adding the CAI. A few days ago I finally got my dealer to replace the plugs and check out my car for performance issues. The car is now running very nicely. I just filled up so I'm on my first tank after the tune-up. It SEEMS a bit better but I want to measure to make sure. I have 37,500 on the car and they replaced the plugs and updated the ECU.

I think after installing the CAI that the engine was now getting much more air than it had previously and it leaned out the engine, which made it much less forgiving of the condition of the original plugs. It's performing smoothly and strongly now so hopefully the mileage will go back to pre-CAI levels.

this is just the reverse effect of when everyone was installing their units in spring and suddenly getting 2 more mpg.... when in reality they were just switching from winter fuels to summer fuels -shrug-In my case, that's not true. I noticed the (slightly) better gas mileage when I was already long using the summer fuel.

its the gas. a friend of mines family is in the gas business. his dad says you always loose mileage with winter gas. I noticed it in my civic every winter..

is that really true^^^^

Update - Perhaps my Economy is coming back to before?

Just recorded 17mpg

Maybe you're just slowing down :D:

Things will level out eventually. My first tank after the REVi was 13mpg! from 18mpg! After a few weeks I am now getting 18-19. The tone of my box also mellowed a bit from a hollow roaring sound to just a deeper sounding stock engine.

Maybe I'm crazy, but:

1) Ishu has a point about the sound change. I swear that when I first installed it, that a redline run would rattle my interior (read: very loud). Now, however, it's just a nice throaty roar (read: Sporty, but pleasant) without being able to rattle anything anymore. I have no idea why...

2) I noticed ZERO change in my MPG. I get the average of 17.5 city and 21.5 hwy in the winter. The temperature definately effects my MPG. In the summer I get 19.0 city... ~9% increase.