If he's going by the overhead, he's fooling himself. The 275 RV injectors
have a larger opening, and deliver more fuel for the same amount of 'ON'
time as the stock injectors. This develops more power, and therefore less
'ON' time is needed for the same power output as the stock injectors.
The computer has no way of measuring the fuel flow through the injectors -
it knows that at a certain RPM, and a certain amount of 'ON' time will
deliver a certain amount of fuel. It uses those assumptions to calculate
Miles travelled per tank of fuel is the only reliable way to calculate fuel
economy, and then only if you fill to the same level each time.
While I can't speak for a Dodge, the readout on my Duramax is also off
slightly compared to my actual calculations, but it's consistent.
While it may not give dead on numbers, it's easy to see trends. I
think it would be close enough to show an increase from 19 -> 25,
although in reality it may be 17.5 -> 23.5.
Does the Doge have an "instant" mpg readout?
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