RotoRocket

iTrader: (1)

Okay, thanks man. I'll give it a shot.




Eight - I know. I do get great mileage. Just lucked out I guess (I also redline at least twice a day ).

raphy3

Judging from the wild variance in miles traveled and actual mpg, it looks like you're not filling up the tank completely on each refill. Or in other words you're not running it to empty every time.
I have read somewhere that the first half a tank gets you better mileage than the last half a tank. Anyone think this could be true? I've never believed it myself, but some of his numbers look like they could confirm.

I basically always fill my tank up as soon as the light comes on. I always use 93, and I don't make preferences for which gas stations. I choose the cheapest ones (well I go to the same two stations that are right next to me).
We are also stuck with 10% ethanol BS over here. I find that somewhat amazing actually they're forcing us to pay for 10% ethanol with these ridiculous gas prices.

Swoope, how do you do it. What does the room fuse disable? Radio and lights and everything? And also you are saying 87 gets better mileage, or is it just for the cheaper fuel, but same mpg as premium, hence more efficient money-wise?

swoope

iTrader: (5)

pulling the room fuse resets the ecu. clears the fuel trims.. start from scratch.

like pulling the battery cable.. and you just remove and replace the fuse. you cant keep it out. car will not start.

and yes, i find that 87 does give better mileage.

beers

Gopherage

I've found the harder I drive my car the better mileage I get. I know it sounds strange but if I shift later and get away quick from lights and stop signs and then go drive on the highway my car seems to do better then just driving on the highway. I don't know why it would but I usually make my commutes from school and get horrible mileage, but I went to visit a friend in Pennsylvania and even got stuck in traffic going nowhere and got better mileage then I usually do. I attribute it to the fact that I didn't try to baby that tank of gas at all and now I drive my car hard all the time and it seems to keep me above the 21's. It's weird I guess our cars love to get moving.

raphy3

ok this sounds like pretty good info. So the main idea is just to reset the ECU so it will readapt to how you drive.
I'm going to try this with 87 next time I go on a long trip.

Earl the Pearl

This is interesting because I just noticed a 1.5 mile per gallon jump on the last two tanks after the car hit 31,500. I originally started to question whether the gauge was reading right but now I average close to 20 while before it was about 18. This is a 50/50 mix of highway and city.

TheBlackmobileR3

Im gettin about 240 miles per tank (all highway).... I got about 1,600 miles on the car (mpg SUCKS)

wantan8

That is pretty terrible for all highway. The 09s have a 16.9 gallon tank right? Well, divided by 240 that makes about 14.2 mpg highway for you. Wow.

Vlaze

iTrader: (14)

Make sure you guys are doing the math right. As in when you fill up don't take the mileage report and divide it by your tank size, but divide it by how much you put in the car on a fill up. That's the total you've actually used. My truck posts 19gal tank, yet when I fill up when it's on E, it only fills up around 16 gal each time. Probably the gauge could be tweaked more accurately but point remains the same. How much you put in the tank to full is how much you actually used for the distance.

JinDesu

iTrader: (2)

Yeah, that's a very good point. I almost always fill up 13 gallons on the dot, instead of the 15.whatever the tank is rated at. There's no way I can drive all the way empty..

km1346

I just recently got my rx8 about 2 weeks ago
Its an 04 Silver Auto. ( couldnt get manual... parents )
ive been fillin it up with premium v power from sheel
but i get about 138 miles off a little higher then 3/4 of a tank.. which is really horrible i think
i think that averages to 9 maybe 10 MPG... which is really low and you guys are gettin 200?
anyone know how I can fix this? Any suggestions?

New2u

Are you letting it get to the point where the fuel light comes on?
The reason I ask is because my fuel gauge towards the middle runs down
quickly but towards the end it goes slow so, if you only get 138 miles till
the light comes on, that's quite bad. The fuel light comes on roughly with about
3-4 gallons left (at least on mine).

The other question is how do you drive it, do you drive it ***** to the wall
or are you more of a conservative driver? When you shift could be another
thing to look at, when do you shift, around 3k rpm or around 5-6k rpm (or higher)?

exsequor

iTrader: (1)

man thats not normal imo..you must be gettin 10mpg in stop and go!

Vlaze

iTrader: (14)

Highway wise averaging 70 (55-65 zones on and off) it shows potential to easily tap beyond 340 miles for a full tank on my '06 MT GT trim depending on what speed I'm going most frequently. So it's around a 22-23 mpg range for highway, not too shabby.

Mixed I get about 18.5-19.

Oh and it's unfortunately breathing that ethanol crap in the NE with no station around that doesn't use it.

CarAndDriver

Wait till the light comes up and fill up and do a couple tanks before you draw a conclusion. If it really is that low - something's wrong.

Spicewood Rotary

Cannot understand all the commotion over gas mileage. I have two 8s, both 2008s, one a MT and one a AT. The MT gets 21.5mpg and the AT gets 23mpg on winding country roads driving above 60mph. The "fun factor" alone could be worth forgiving 5mpg. I wish everyone on these 8-threads who long for Prius-mileage would actually drive one...it would leave the 8s to all of us that appreciate it for the practical sports car that it is...

km1346

yeah i drive the car real hard sometimes but then i noticed the gas dropping so i started driving more conservatively...
but yeah i let it go till the E light comes up but i filled it up today fully for the first time so ill get back after im fully down, normally its a little about 3/4 of the tank so i get about 138..

syntheticdarkness

iTrader: (7)

I get 22c/25h and I redline it quite often. I have an 05 mt with 88,000 miles on it and have aem intake/ralco pulley set/agency exhaust, and I run 93 in it/5w20.

That prius is a joke 45/50mpg and in a few years of owning it you gotta replace the batteries which is around 6k which I got the price from the toyota dealer, so where is the real savings going since the car is 22,000-26,000. This is just my opinion.

chiketkd

iTrader: (5)

I know on a recent road trip to the Watkins Glen area of NY, I averaged 26mpg on the highway cruising at 70-71mph. I got right around 370 miles on my best tank and it took 14 gals to fill up. My car has ~50K miles on it. I typically get 21-22mpg in my daily commute which has ~50% city driving.

Mods: New OEM plugs, wires & coils, along with a green air filter and corksport exhaust.

RIWWP

iTrader: (2)

I basically did once. All highway, filled up 15.4 gallons. I was a bit nervous the last few miles But my light comes on at 13.3 gallons from full every time, so I calculated I have 2.6 gallons free, or at least 39 miles with a horrible 15mpg, but I average more like 19-22, which is 49 to 57 miles left.


Redlining it non-stop will certainly hurt your gas mileage, but so will never driving it hard. The best mix for good mpg is punch it a couple times a day, and cruise relaxed around 3.5 to 4k the rest of the time. Keeps mine healthy.

Motor Trend or something did a calculation between the Hybrid Camry and v6 Camry. The extra cost of a Hybrid vs the extra cost of gas with poorer mpg with the v6. They threw in the tax breaks, incentives, etc... just assumed same other equipment and same financing. They found that the break even point is almost exactly 100,000 miles. If you keep the car less than 100,000 miles, it is cheaper to buy the v6. If you get the hybrid, it will only pay off after 100,000 miles.

Seriously, you want MPG out of a rotary? Get a true hybrid:
http://www.autoblog.com/2009/03/03/g...r-by-giugiaro/
http://www.autoblog.com/photos/genev...namir/1400772/
Somewhere else it said that the frame only weighs like 1400(?)lbs, so total weight probably in the 2400 range. Also doesn't mention that the 814cc rotary has a mini turbo on it

syntheticdarkness

iTrader: (7)

Nice. To get those I'd have to sell my legs and arms and what brain I have left.

05rx8mazda

iTrader: (4)

on 13.7 gallons of gasoline i reached 310 Miles.. 66K miles Mt 2005.

arexate05

I get the same exact mileage on my '05 Shinka as I do on my '07 CX-7: 23 Highway, 19 city.

The funny thing about my car, is thad the fuel gauge acts really different from every other car I've owned. at the 1/2 tank point, I've driven about 100-115 miles. This scared the crap out of me when I first bought the car. BUT, then the gauge slows down. By the time I refuel, which is a while after the empty light is on, I've driven anywhere from 270-300 miles. I usually fill up 14.5 - 15 gallons per gas station visit.

also, all highway driving definitely improves the milage on my car; the most I've driven with a single tank was 320 miles before refill.

I only use Shell V-Power (93 octane).

hkspoweredrx8

iTrader: (1)

All I know is, my 8 drinks some gas...Like one quick 15 min trip up town, then a drive back...drops like 1-2 notchs...bs.

i miss my 99 eclipse gs 5sp....i got over 550 miles on a tank of gas...16gal. I think i avg. 38mpg
had an i/h/e though...but still.

shazy

70% city I get about 250miles on a full tank. If Its 50/50 I get about 270 and if it's full highway I can get max 330miles I think I have a really good rx8 for fuel mileage.