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wider is better what is OD ?
as per the auto speed article
wider is better , for FE and every thing else as well
except drag
did you account for the change in OD of the tires ?
larger OD tire will cover more ground , but show the same value in the odometer , your FE numbers will be affected .
have you compared actual distance covered to measured distance covered ?
errors in the speedo can be huge and quickly seen by comparing speed on a GPS to speed on the speedometer
and
do not assume the odometer shows you actual distance covered
on your next long trip
compare your odometer values to the mileage markers on the side of the highway
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using your new scan tool
look at calculated load , never at absolute engine load
lower calculated load is better for fuel economy
most of the time
calculated load should get to real close to 100% at WOT up hill over 4k rpm
if not
suspect restriction to flow somewhere .
clogged cat or restricted air filter or air filter ducting
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