Project Grand Cherokee Thule Fairing?

[Red]

Originally Posted by massimofinance

3) Replaced my air filter and spark plugs
4) Remove all excess weight from the car

The 4.7 probably doesn't care about those two. I know my 4.0 doesn't

[ankit]

Originally Posted by massimofinance

After two weeks, I am still clocking 15.1, so it is clear to me none of the above worked, unless (a) I need more time for the onboard diagnostic tool to record any saves, or (b) these "fixes" do nothing for V8 S.U.V.s.

Any one have an idea?

Most likely you are looking at your number off of an computer on the car. You should calculate your MPG manually (miles/gallons) at the fill-up. Um, if you are doing it manually then never mind my post.

[TrikeKid]

Originally Posted by ankit

Most likely you are looking at your number off of an computer on the car. You should calculate your MPG manually (miles/gallons) at the fill-up. Um, if you are doing it manually then never mind my post.

Yeah, be very wary of those built in gauges, my mom's Chrysler will read as low as 18 running down the freeway at the speed limit (EPA rated at 24 highway, of course, my mom wastes gas like it's her job too...)

[Big Dave]

The only instruments that count are the odometer (check it with a GPS if you can) and the fuel pump.

The electronic thingies are OK for detecting changes but in general are electronic politicians.

[MetroMPG]

A ScanGauge or MPGuino used in controlled circumstances - mutiple, speed-controlled, bi-directional A-B-A runs, on an empty road - is the best method of measuring a mod's in/effectiveness.