[McDesign]

Just found this site: I've got lots of reading to do! I'll start by posting my results - please ask any questions / criticize, whatever.

This is what I have – directly from my modification diary for the car. Most of the gas was from the same station; the same pump. Always filled the tank to the pump’s automatic cut-off. All of the driving was mixed, the same commute, about 65% Interstate.


(first recorded; tires are ~ten years old)
15AUG11 345 miles@ 12.927 gallons = 26.7 mpg
1SEP11 358 miles @ 13.791 gallons = 26 mpg

(first tank on new LRR tires at 50 psi)
21AUG11 397 miles @ 14.264 gallons = 27.8 mpg
26AUG11 396 miles @ 13.6 gallons = 29.2 mpg

(-mirrors, antenna, mudflaps; + wheel discs)
9SEP11 406 miles @ 13.748 gallons = 29.5 mpg
16SEP11 446 miles @ 14.545 gallons = 30.7 mpg
23SEP11 435 miles @ 14.71 gallons = 29.6 mpg
2OCT11 421 miles @ 13.871 gallons = 30.6 mpg

(lowered ~2-1/2")
11OCT11 474 miles @14.42 gallons = 32.9 mpg
24OCT11 470 miles @ 14.753 gallons = 31.9 mpg
31OCT11 483 miles @ 14.72 gallons = 32.8 mpg

(full skirts, 0° toe-in)
7NOV11 476 miles @ 13.50 gallons = 35.25 mpg
14NOV11 468 miles @ 13.991 gallons = 33.5 mpg
22NOV11 486 miles @ 14.47 gallons = 33.6 mpg
29NOV11 502 miles @ 14.692 gallons = 34.2 mpg
8DEC11 510 miles @ 14.83 gallons = 34.4 mpg
14DEC11 488 miles @ 14.47 gallons = 33.7 mpg
10JAN12 496 miles @ 15.0 gallons = 33.0 mpg
19JAN12 477 miles @ 14.581 gallons = 32.7 mpg
26JAN12 466 miles @ 14.4 gallons = 32.4 mpg
16FEB12 453 miles @ 13.677 gallons = 33.1 mpg
5MAR12 486 miles @ 14.7 gallons = 33.2 mpg
22MAR12 466 miles @ 13.7 gallons = 34.0 mpg
4APR12 500 miles @ 14.7 gallons = 34.0 mpg
13APR12 508 miles @ 14.67 gallons = 34.6 mpg
22APR12 508 miles @ 14.22 gallons = 35.7 mpg
28APR12 485 miles @ 13.9 gallons = 34.9 mpg
22MAY12 480 miles @ 14.1 gallons = 34.0 mpg
7SEP12 501 miles @ 14.575 gallons = 34.4 mpg

(GasPods added)
14SEP12 513.5 miles @ 14.262 gallons = 36.0 mpg
21SEP12 499 miles @ 14.329 gallons = 34.8 mpg
1OCT12 506 miles @ 13.975 gallons = 36.2 mpg