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#2) Go up the initial hill in 1st gear all the way or #3) Try to go up in 2nd as soon as as possible with my foot to the floor. (It's a moderate climate, so "cold" engine is just a relative term.)
IMHO, #2 would be best, but not with the engine screaming in 1st. #3, foot to the floor is never good. Warm up idle creates negative MPG and should not be used.
#3) option of leisurely acceleration with lower load through all the gears until reaching 4th or 5th would use the most fuel.
IMHO, #3 is the way to go, it will not use the most fuel.
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