Back from the road trip and have some data to report.
I shall break this into two parts. The first part will be the Sarasota to Atlanta leg and the second part will be the reciprocal trip.
Part 1:
I decided to not vary computer tunes during this leg. The tune was a Bama Chips (
http://www.bamachips.com/ ) custom tune that uses 89 octane fuel. The tire air pressure was 42 PSIG.
I made it from Sarasota to just north of the Georgia line and ran into a most horrendous traffic FUBAR due to so called highway construction. This jam lasted for 45 miles the first part and then 34 miles. The traffic flow, if one could be so kind as to call it flow, was about 1 MPH. I was in this stop and go for almost 2 hours.
I knew that gas mileage was going to be shot to hell. And it was; when I refilled in Atlanta. I used 17.6 gallons of Amoco 89 to travel the 511 miles. That was a whooping
29.07 MPG.
Part 2:
The return trip used the same custom computer tune, Amoco 89 fuel. I decided to divide the return trip into two parts; the drive from Atlanta to the state line and the state line to Sarasota. The first leg was 239.7 miles and the second 271.3 miles.
I refueled at the state line. The first leg was at an average speed ( GPS determined ) 64.8 MPH. I went the 239.7 miles on 6.2 gallons of gas for my best ever mileage of
38.6 MPG.
Encouraged by this data, I averaged 72.6 MPH on the second leg and netted only
34.9 MPG. Speed kills mileage.
Overall, I am very pleased with the mileage gains afforded by the underdrive pulleys; however, more comments on the underdrive pulleys in a later post.