RX-8 Discussion Discussion on Mazda's newest rotary powered vehicle.

better mpg?

Old 10-30-2013, 11:02 AM
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Question better mpg?

im 16 and im just curious is there any mods I can put on my 2004 rx8 auto to get better mpg?
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Old 12-22-2013, 04:13 PM
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Default Re: better mpg?

I have 2004 rx8 gt 6port 6 speed. I swapped the 4.4 for the 1993-95 rx7 4.1. I also have ls2 coils stock exhaust.

The car feels better with the taller first gear and gets 21mph normal driving and 19.5 with AC tuning in summer. No noticeable loss in power do to gear swap.
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Old 01-25-2014, 05:16 AM
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Default Re: better mpg?

16 year old with an rx8? Lol good luck kid.
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Old 08-29-2014, 09:26 AM
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Default Re: better mpg?

Originally Posted by Dirtyswiff View Post
16 year old with an rx8? Lol good luck kid.
Thinking of getting an rx8 for my son. Can you explain?
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Old 08-29-2014, 12:05 PM
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Default Re: better mpg?

Rx8s are great but Mazda did make a few major flaws.
The most important thing to upgrade is the coils. This can cost $350-$500

The factory rx8 coils burn up quickly 30,000 miles normally. The chevy ls coils last forever. When the coils go bad the car runs rough waste fuel and builds carb that can quickly destroy the engine. Upgrade the coils right away and you can avoid flooding issues, starting issues, wasting fuel, clogged exhaust, poor performance.

Any rx8 you buy do the coils.
The 4.1 rear is also a nice worthwhile upgrade, it will save you fuel and extend the life of the motor but I have only done this on the 6port 6speed manual and this won't make much diffrence if any on the automatic version, it might not be effective on the 4port manual 5 speed either.
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Old 08-29-2014, 01:35 PM
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Default Re: better mpg?

thanks. It is an automatic.
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Old 04-01-2017, 09:11 AM
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Default Re: better mpg?

If u don't need to get to 60 in 7 seconds bring the rear gear to a 3.73 and u will get even better mileage no matter ur trans it will lower the rams at why speed
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