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Old 02-26-2015, 12:12 PM
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Fuel eceonomy

Hi guys !

How far (in Km) can a 2005 RX8 go if the needle is pointing at the bottom mark with the fuel warning light on ?
Old 02-26-2015, 12:18 PM
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not far for long, your gonna burn up your fuel pump
Old 02-26-2015, 12:21 PM
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It should be pretty easy to figure out?

When the light first comes on, the gas tank can usually take in about 13.1 US gallons before becoming 'full'.

The gas tank is listed at 15.9 US gallons in size.

Therefore when the light first comes on, there is 2.8 US gallons left in the tank.

If you are only getting 8mpg, that is 22.4 miles.

If you are getting 24mpg, that is 67.2 miles.

You know your mileage, I do not, so you will have to do some math.
Old 02-26-2015, 01:55 PM
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RIWWP is correct. my own testing when my 2008 40th anniversary edition was new back in 2008 ,had about 2.5-2.7 US Gallons left in the tank when my low fuel light came on.

And 200.mph is also right. In 2013 I had to replace my fuel pump as it was suffering overheating and fuel cut off below 1/4 tank with long sustained highway speed driving in 90+ degree Southern US States driving.

High pump load (sustained high speed driving) and high heat combination is a killer for these older Series 1 pumps, especially below 1/4 tank, where the pump is uncovered and gets no cooling benefit from being submerged in the fuel in your tank.

Yours is a 2005 so depending on your mileage your pump is certainly old enough to be prone to fail at low fuel levels. Be careful. My advise, don't drive it down to the low fuel level if you want your original series 1 fuel pump in a 2005 to last.
Old 02-27-2015, 02:52 PM
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Only one way to find out. �� I consistently got 6kpl so maybe 15km.
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