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Rx8 using a lot of gas

Old 01-16-2010, 03:15 AM
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coils spark plugs wires compression cat
Old 01-16-2010, 04:35 PM
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Wait wait wait half a tank in 30 miles
15.9/2=7.95
30/7.95=3.77mpg
I think you have a hole in your gas tank.
Old 01-16-2010, 07:00 PM
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Do you have a leaky injector ?
Old 01-16-2010, 09:26 PM
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dont drive it as much, if your looking for good gas mileage check your local listings for a toyota prius
Old 01-16-2010, 10:19 PM
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that's crazy.. i would refil at a different station before jumping to conclusion. The first pump might have been way off or you put in less then you thought
Old 01-17-2010, 01:04 AM
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Originally Posted by 360nos
Ive put gas in it three times already at two different gas stations (Chevron and Shell).
thats completely retarded. even with new plugs/coils/wires it wont improve so much if its that bad. I changed all mine and i still get 180 miles to a tank.

But yours is just ridiculous. Take it to the dealer asap
Old 01-17-2010, 01:19 AM
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Clean the mass air flow sensor first! If mpg dont imporve then go from there.
Old 01-18-2010, 03:30 AM
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any leaks under the car? can you smell gas?
Old 01-18-2010, 08:27 AM
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Inspect your underbody, exhaust system, O2 sensors, and get a tune up. No CELs?

Also re-examine your driving style. I've gotten as bad as 11 mpgs outta my 09 when really pushin it, but as good as 24 on long highway trips.

A good history of the car's mods may shed some light.
Old 01-21-2010, 04:54 PM
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well i get around 16 mpg on the highway i have an 04 automatic and i get 220 miles to the tank i thought mines was bad
Old 01-21-2010, 05:05 PM
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may want to check out your fuel system and make sure none of the components are worn out, that could be the problem and you could not know unless you disasemble the system
Old 01-21-2010, 06:43 PM
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Have you thought of checking your O2 sensor. That is an issue of gas being used up quickly.
Old 01-24-2010, 07:42 PM
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Originally Posted by 360nos
Yeah it didn't help. Im going to replace the spark plugs and wires and then coils and then go from there.
+1 on the plugs. I know when I start getting shitty mpg I have to clean the maf and check or change the plugs
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