[Diesel_Dave]

Originally Posted by suspectnumber961

At 37.7 mpg for the last 2 tanks and and ~ a 35 mpg summer avg last year...and if the next full tank comes in at a similar level (3 tank avg)....I'll have managed a 7.8% gain from adding a cone filter....A-B test complete.

Warmer temps have probably helped though....

2003 Ford Focus ZX3 w/Zetec DOHC engine Gas Mileage (Elroy) - EcoModder.com

A while back some of us who keep weather data in our daily logs compared notes (http://ecomodder.com/forum/showthrea...cts-20561.html). A rule of thumb that emerged was ~1% change for every 2 deg F change in temperature.