RX8 fuel consumption...

[carreauchompeur]

I know it's meant to be fairly heavy, however I have recently acquired a 2004/54 192, which has done about 250 miles to about £85 of fuel.

Does this sound vastly excessive? It does have another minor issue so I'm trying to diagnose what fault we might be looking at..

ETA- This comprised of 2 80 mile trips on A roads, a couple of c.20mile trips on A roads and some town work, not too much stop/start.

Edited by carreauchompeur on Sunday 26th June 18:34

[nottyash]

My Dads 231 used to get very early 20s, your getting about 18.5mpg at £1.36 a litre which is quite low. I would say that was a bit excessive.
He said it appears to get the same MPG regardless of how it was driven.

[otolith]

Yes, that is on the low side. Should be able to get low 20s on that sort of cycle.

[carreauchompeur]

Thanks, I thought as much... Suspect it's a problem with a couple of coil packs, maybe cat might also benefit from replacement... Currently on eBay so will see what someone wants to offer me!

[otolith]

Cat tends to lead to increased fuel consumption and eventually loss of power at the top end. Coils can fail pretty much invisibly but can lead to serious engine damage (and failing catalytic converters).

[Ozone]

I rarely got more than 200 miles to the tank from my 192 and that was from new. I would say you are doing quite well. If you go to the owners club site some people get 300 miles to a tank on occaision which surprised me as to how they manage it. I didn't spare the revs though

[carreauchompeur]

I'm certain it is the coils- Throwing a "rear rotor misfire" ECU code, and runs noticeably rough in damp conditions. Sounding a bit throaty too so suspect the cat might not be healthy...

...The sad thing is it's a one owner car, serviced properly etc, but after being traded in it's probably been shunted around various yards, etc for the last month flooding the damn thing!

[Garybee]

I'd question whether the petrol station is giving you as much fuel as you think. How much are you paying per litre to get £85 in? With a 50L tank (about as much as I get in mine) that would work out at £1.70/L!

I get mid-20s out of mine on average, usually 250-260 miles when the light comes on.

[carreauchompeur]

The £85 is actually a fillup of about £70 and a few cans at £5 each...

[Garybee]

Ah, gotcha, I thought that maybe the pump you were using was lying about how much it was giving you.

[Dave_newcastle]

On our Le Man trip this year we got an average of 22.6mpg, two up with loads of camping gear and over 1250 miles
- thats in an 08 231 with 22k on the clock and measured accurately against tank full to tank full

[wolves_wanderer]

Between 20 and 22 here. I have had as low as 18 but that was less than 5 mile journeys.

The coils are not a service item but need doing around 30k miles really, failure is largely invisible and can cause cat problems and premature engine wear. It is an easy DIY job and the parts are around £200. Well worth it for peace of mind.

Edit, that's on a 231 the 192 is apparently slightly better (haha) on fuel.

[marcosgt]

Like most other people, I get 20-23 usually - A long run will yield 25, but never better than that (I have seen the magic 300 Miles - twice I think ).

200 on a tank every time sounds very high though, especially for a 192, which are supposed to be a little less thirsty, but I guess if you cane it all the time, that's the result

M.

[CarbonBlackM5]

The coils went the day I sold my car (had around 35K on the clock). Luckily I it had a Mazda warranty so although it was a pain in the arse the new owner managed to sort it out.

My car was immaculate and company maintained but I didnt realise it would needs new coils around the 30K mark. I think dealers/garage should point this out when servicing the cars.

Thinking back my MPG was terrible before I sold it and warm starting was poor (often a sign of them going)

[otolith]

Poor warm starting is often a sign that they have been knackered for a while and engine damage has already occurred as a result

[carreauchompeur]

otolith said:

Poor warm starting is often a sign that they have been knackered for a while and engine damage has already occurred as a result

Yep... Mine has the issue. Very bizarre though- Changed the battery and the warm starting was fine, but there was a slight misfire still. Changed the plugs and one coil, and now it won't hot start again... AAArgh!