Driveway Opportunity Park Quandry

[Doofus McFancypants]

Hey All

Have a question. My driveway has a fairly decent slope to it - but is about 2 carlengths long. I have been EOC'ing down the block, into the driveway and up to the place where i park the car - sometimes make it all the way up - sometimes only part way up depenging on speed.

In the morning i EOC out the drive way into the street - then key start and drive off.

Pondering if it would be better to do the following...

when i come home ( hot engine) EOC just past the driveway key on and reverce up the driveway allowing me to EOC out the dirveway and key on so i can start with car moving instead of from a stop.

So i am tradeing off my EOC to a stop + cold keystart from a stop
vs
Keystart Hot and reverse up driveway + cold keystart with car already in motion.

I will set up a spreadsheet where i can log some SG data to see what is better. I have a feeling the error in readings will cause this to not be any noticable change - but with 260 work days a year - a little change could add up.

Am i killing myself with data here - or is this worth experimenting with?

Steve

[MetroMPG]

I think pondering the finer details like this can be fun.

My guess is you're slightly more efficient using your current routine. Driving (reversing) the vehicle from a stop up a "decent slope" is going to use more fuel than starting it on the level street the next day to get you going after you've coasted out backwards.

[Doofus McFancypants]

initial test results are inconclusive.

I marked some points where i could consistantly start and stop this test. then begin some rudamentary data collection w/ SG.

Friday after work - ( coming home with warm engine) I reset scangage trip during EOC about 1 mile from house. i then calculated the gallons used in a "normal " home trip parking pulling into driveway.

Early Sat am - had to take daughter to swim class - so i captures the gallons used pulling out "normal" - coasting into steet then key starting and driving off. i captures the data while i was EOC - Stopped at a cross street.

So Saturday afternoon - returning home i backed up into the driveway - then this morning when i left - I pulled straight out.

Granted this is a whoppoing whole 2 data points - but so far the numbers are identical for gallons used for the same start and stop points i chose. ( 0.2 gal)

i think any savings may be in NOISE of the measurements. I will continue this week gathering data and will let you know what i find.

I do not think this is to much of a waste as i have to park and leave for work anyway - besides - it gives me something to contribute to the forum with actual data
: )

Steve