Also be advised that when they do the EPA MPG test the everage speed
on highway test is 48 MPH and max speed is 59. I do not know anyone
that averages 48 MPH on highway around here. Also something else they
do not tell you on sticker, MPG tests are conducted using 93 octane
fuel and have been for many many years but the "law" does not require
that to disclose this on window sticker.
Tx Karl....My present vehicle, 02 5.3, 3.42, auto, lists 15/19 on sticker.
I drive most in city, 80% and have tracked mpg since new and its average to
date is 16.51. Todays fill up @ Costco, 87 grade was 208.1/12.701 = 16.38
(1198.1 Eng hrs). The E85 fuel, is cheaper?? but gets less mileage than
E85 is 20 to 30 cents cheaper than 87 octane gas. I just thought I'd run 4
tankfulls and check the mileage. I think I'll go back to 87 octane and
after 4 or 5 tankfulls. It will be easy then to see if one is really
I don't see much difference in performance but I am not hauling or pulling
I believe I have seen this info before, tx for comfirmation. Just wondering
about the "active Fuel management" that is on the 2007 5.3 engine and if it
really did something or was 90% marketing and 10% fact. :0) Checking the
lesser cost of the E85 fuel vrs decreased ?? mileage/performance will be an
Acording to fueleconomy.gov, a 2007 model converted to new rating
being used starting in 2008 in a attempt to make them more accurate,
it will be rated at 13/17 on gas and 10/13 on E85. A new Dodge half
ton 4x4 with a 4.7 in typical Dodge fashion for lowest ratings will be
rated at 8/12 on E85 (same for durango)
The heat energy in fuel drives a engine. pure gas has about 125,000
BTU per gallon and Ethanol about 68,000 BTU a gallon. E85 has around
80,000 BYU a gallon so do the math , MPG will be less. Also Alchol is
considered a preburnt fuel (high carbon content) and what this means
is that a car running on E85 also emits about 50% more CO2 per mile
too but politicains do not tell you that either.
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