This is a follow-up to this post: https://www.ford-trucks.com/forums/6...e-results.html

All data points are reformulated unleaded, except for the last two which are E85.

Gas 4/9/07 to 7/6/07: 87 Octane with 10% ETOH purchased at the local Kroger and at the same pump every time.
Gas 7/12/07 and 7/16/07: E85 (85% ETOH and 15% Unleaded) purchased at the local Kroger, at the same pump.
Driving Habits: 60 to 70% city. I'm not heavy on the pedal on a regular basis but I occasionally like to hear what I've paid for.

Modifications
Tonneau Cover: UnderCover installed 6/2/2007
CAI: Volant installed 5/12/07
Cat-Back: Magnaflow Model 16614 installed 4/12/07

Results:
There is a modest increase in mileage that has little to no significance. The slight increase could also be attributed to the fact that the engine is still breaking in and as of today has only 6200 miles. There is no evidence of a substantial individual or cumulative affect of the three add-ons. Also, seasonal reformulation of the gas around here could also affect the results.

However, the most interesting finding is that the trip computer's MPG estimate looks accurate. I found this surprising seeing as I've read many posts that questioned it's accuracy. I reset the computer after every refill.

The Average Cost/Mile:
Unleaded: $.08/mile
E85: $.11/mile
There are only two E85 data points so I assumed the same miles (about 235) and extrapolated 12 more E85 points to provide an average of 264 miles per tank for all data points. Given average miles driven this represents about $8 per tank difference or roughly 27% difference to run E85.

Keep in mind that my only unleaded source is reformulated 10% ETOH gas for added oxygenation. If you are in area that receives non-oxygenated gas the differences will be greater.

The only upgrade left to test is an Edge Programmer. Once I procure one I'll add some data points and post the results. If the data remains this flat I'll also be posting a few items on Ebay.

 

Very nice info Bridge. Thanks.

CMOS

 

Nice write-up.

That has been my experience too. If you do mostly city driving, the simple bolt-on performace parts don't do anything to increase MPG's. I got tired of the noise so I sold my Airaid intake and Magnaflow exhaust.

 

most improvements are made on cai's and exhausts are made at high rpm's usually outside the average driving range. although I do have a edge on my f150 but nothing else.