I say do the free stuff first...techniques will get you more mileage free. Taller tires will bump your gear ratio a bit and might help...but use up what you have already. Some kind of "guage or readout" would help perfect your hypermiling techniques. Higher psi is also another freebe...remove any excess weight...synthetic oil with a lighter weight...clean air filter. See what you end up with.
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2006 Jeep Liberty CRD... Founder of L.O.S.T.
OME 2.25" Lift w/ Toyo Open Country HTs 235/75/16s
ASFIR Alum Eng/Tranny/Transfercase/Fuel Skids
2002 Air Box Mod...Air Tabs (5) on Roof...(3)each behind rear windows
Partial Grill Block with Custom Air Scoop and 3" Open Catback Exhaust
Lambretta UNO150cc 4 Stroke Scooter
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