Siraniko

iTrader: (13)

You cant compare apple and bananas. You want good gas mileage, you chose the wrong vehicle. Besides, the stockers are never gas efficient in the first place.

High gas prices are good for me. Since I dont drive my cars, maybe the engines will last til I retire, 30 years from now.

d0 Luck

some dooode here in the forum usualyl says................... "junk it"

staticguitar313

iTrader: (2)

**** that, smash the egg and roll the apple.

Pele

iTrader: (28)

EFI with a good intake and exhaust... Upgrade the ignition too.

"Tofuball" here on the forum is running an S5 Vert. Ported intake manifolds, a cone filter, and RB exhaust got him around 28 MPG... In a 3000 Lb car. Not bad.

Then he went and put it down with a Megasquirt... But one he gets it tuned right, it'll be nice.

RXDad

iTrader: (2)

Drive the highways instead of the back roads. Clutch in and coast down the hills, draft a big bus going up the hills.

Don't tailgate. Back off enough so that you can use constant throttle.

RXDad

dj55b

iTrader: (2)

Honda??? I say lets all get a 3 cylinder geo, or lets all get a vespa scooter. You can pick one up for less than 3,000$CA and you can get about 250km on a tank of 5.5litres (1 1/2 gallons)

OneRotor

iTrader: (3)

to save gas, and my transmission (it's on it's last leg), i shift at 3k. with some dicking around and 70 miles on the highway, plus some on the backroads in the middle, i got 154 out of 1/2 tank.

i went to work on my 7 at my grandparents house today, they live ~70 miles away, and I averaged 23 mpg on the way back, running it up through the RPM several times. mods: bp12a (starting to think it's not bridge ported, but that's what the previous owner told me), msd blaster 2's, holly 465, holly blue pump, -6 lines, 8.5mm wires, new plugs, new clutch, new flywheel, rb sp header, rb duals, fresh 80w90 in tranny and rear end.

dj55b

iTrader: (2)

whoa ... you're actually pulling off 23mpg with a holley, and supposebly a bridgeport .. now thats crazy.

christaylor

I read through the first few posts in this thread, and they were totally worthless. Hopefully Carl will trim it down to the responses he was actually looking for, which brings me to my response...

My street car (before I started driving the Miata which gets 30MPG when I flog the **** out of it and 40 when I slow it down) would get 24MPG as long as I didn't hit too much stop and go traffic. My dad's racecar (when it was street driven) would get 26 on the highway. Not bad for a bitchin' sportscar. But even so, the Miata isn't gay enough to preclude it's use as the current DD.

My street car is/was a rolling pile of ****... cat dragging the ground, huge gap in the manifold that would open when I hit a bump, horribly tuned (or rather, never-been-tuned), etc., etc. It's now got a new exhaust with a stock mani / presilencer / cheap-o muffler, so maybe I'll fill'er up and see what it gets now. The racecar is a bone stock (from the factory stock) 127RWHP Monster with an RB header and (at the time) presilencer with stock over-the-axle hump to a Supertrapp muffler (usually with 3 or 4 plates on it on the street). It now has a Chris Taylor exhaust on it, but has a bent gas tank and no left rear brake setup, so don't know what the mileage looks like now.

OneRotor

iTrader: (3)

ya, and I ran it through the RPM's quite a few times. I was accelerating onto the highway, and at the top of third i heard a really bad sound. my brother-in-law was like "what the **** was that?!?". hit the flashers, pulled over, and listened to it. it idled fine, took it up through the rpm's and it backfired as the revs climbed. did this a few times, then it went away. we chased an old dude in his firebird, and got it sideways just after we left the gas station shifting into second (rolled through about 1/4 inch of standing water). i was impressed. stayed between 75 and 85 the entire way. my DD minivan pulls 16mpg at 75, and 12 at 85

BlastinSideways12A

I think the reason that the renesis got shoddy mileage is that the car magazines drove it like it was a domestic V8. They probably figured that the best way to get good mileage was to keep the revs as low as possible on the highway and the ECU wouldn't advance the timing sufficiently at those low revs because if it did, the car wouldn't pass the out of this world emissions regulations created by the buerocrats in our oversized federal government. I'm not saying to dump all regulations but we need to let science determine what is safe rather than politics. Anyway i think the 6th gear actually HURTS the Rx-8's mileage unless the cruise speed is high enough to keep the revs above 3000. Another point about the Renesis is the fact that the mixture was richened, especially at WOT (12.0:1) so that the catalytic converters didn't overheat. If you went stand-alone, you could lean the mixture out a bit and tweak the timing, which would probably pick up a considerable amount of fuel economy, not to mention power. With a cat-back exhaust, the restriction should be low enough to keep the temperatures within acceptable levels. This information, of course, is pretty much useless for most of us since we likely don't have an Rx-8. I just like to talk.

Mr_Rx7_Au

My tips:

Drive conservative... leave plenty of room with a car in front of you. When stopping, if possible dont down shift, put in Neutral and roll/use the brakes to slow you to a stop..this will save you needless gearchanging (and your gearbox) for the sake of brake pads.

Try to shift below 3500rpm.... I tried to shift at 3k most of the time. When you feel the need for a blast... try to limit your time doing it.

Inflate tyres correctly. Don't power through a corner. Try to not use the a/c. Use the highest gear pratical for your speed.. ie, don't be in 5th doing 35km/h... nor be in 2nd doing 60/km/h.

BTW, gas prices here in Australia currently is around $1.27 a litre for 91 octane unleaded. 4 litres to a gallon. So 1 gallon is $4.90 equiv.

If you can... WALK your short journeys. If you go to the local shop, can't you walk that 1mile/1km??? when going out with your friends, try to use fewer cars (ie a ball game or something, car pool)

Use local public transport to get you to work etc.

Oh, and I was getting around 12litres per 100km.

US: 3 gallons per 62miles

karism

Some of the guys made some real good suggestions.

Proper jetting will allso help.Remember:It wont help to jet the carb leaner than factory specs to try and save fuel.Why not?You have to open the throttle bigger to maintain the same speed!Anything that will require more throttle than is really needed should be avoided.Make sure your brakes arent dragging(check how easy it is to turn the rear wheels,with the handbrake dissabled)

I get horrible mileage,and i`am trying to get it to still be able to run with leaner jets.No real luck so far.(Its so absurd here in RSA,i cant even drive it with the current fuel prices.)

Karis

Tofuball

DO NOT CLUTCH IN AND COAST.

It takes less fuel to engine break then to idle.

Even the carbs on the first gens have shutters to cut fuel to the rear rotor on decel.

You're right about the constant throttle tho