Actually I was just assuming that the tank (which Mazda quotes at 15.9 Gallons) was filled and JSG got 350 KM on it (which is about 217 miles) and divided the miles he got on his tank. So unless his tank is different than the spec posted in mags so far for the US tank, then he's getting, normally, 13-15 MPG .

 

Sure. I was just pointing out for our overseas friends that those numbers are MP(US)G and equate to 16-18 MP(I)G. Still not good, I'll grant you, but less of a shock to folks who are used to MPG figures based in the larger gallon.

 

gas around Chicago, Illinois is up to $1.89/gallon...they go as high as $2 sometimes during the weekend

 

this is a really innacuate account of his fuel consumption rate... it coudl easily throw the numbers 1 or 2 mpg no problem.

 

But with my 2001 eclipse gt the gas light would come on and i would still have over 3 gallons left so maybe thast the case with the rx8 so instead of of getting 15 -18 mpg for 15.9 gallons u might get that for 12.9 . just a guess but thats how my eclipse is. Because when u see the gas light come on it dosent mean u have nothing left it says u r running low refill its a safty measure.

 

That's actually a good point. My tank only fills to ~14 gallons when I have an 18 gallon tank.

That said, my gas mileage is still terrible because I get ~250 miles per tank, so figure... 250/14 = ~18mpg. But the problem is because I have a bad knock sensor, and it should remedy itself when I get that fixed.

 

I wouldn't know... my low fuel light stopped working like 5 years ago :o Gas around here is $1.29/gal for 87 octane. To throw this in, just yesterday I got 28.5 MPG (!) on my RX-7 doing all freeway driving. I can go about 350 miles before hitting the E mark (2 gal left) on a 16.6 gal tank.

 

My current Miata gets about 32 mpg (13 km/l) when driven conservatively with the top up. Driving quickly through the hills gets me about 24 mpg (10 km/l). My Miata has been retuned to use 92 octane. Driving the RX-8 is going to hurt a little more slightly I guess.

Gas prices in SoCal for 92 octane ranges about $1.80 to $2.00 a gallon. Or $0.47 to $0.52 per litre. "Racing Fuel" at 98 octane is like $5 a gallon, or $1.32 per litre. Fuel prices are cheaper then Japan, but 110 octane fuel isn't readily available over here... so our US cars are probably in a lower state of tune. oh well.

 

What size tank are we talking about for the rx-8?

My old FD with FMIC, exhaust, boost, intake and standalone (no closed loop) could drink 70litres in 290km. That's heavy traffic, AC on, with many many short full throttle bursts.

A guy I work with has a 20B Cosmo that can suck down around 80L in the same distance.

In short:
JC Cosmo (worst case): 3.6km/l
Modified FD (worst case): 4.1km/l
Stock FD (normal suburban): 6.7km/l
Stock FD (highway): 9.2km/l

-pete

EDIT: I should point out I never drive conservatively even for the highway figures.

 

I get 26 mp/g in my 1993 mitsu 3000gt w/ 156k mi on the odo. base 3.0L v6 225hp 205 lb/ft The rx-8 will be a little more rev happy and hopefully a little more responsive in the twisties , but I am not looking forward to a possible decrease in fuel economy on a $30k investment with ten years better technology. AS long as it's not too much different the fun and uniqueness factors will far out weigh the efficiency issues-- even though I drive about 500miles a week

that means one fill up of the 20gallon tank a week Usually for $1.60 a gallon for 93 octane premium

 

it will be intresting to see once we get our cars,how i figure mileage is full tank to gas light on.my current car has 13.5 gal tank but can only squeeze in 11gal every time so ill do it the same with the 8 cause i get real consitant mileage every tank.