worse mileage with dinan software
 

Everything I read here folks have noted increased gas mileage with the dinan chip/software. I have noticed a decrease in mileage on a 96 base with the software. Anyone else experience less?

Yes. Not so much on the highway but definitely in city driving. I'm only running a chip on mine (OBD-I).

I wanted to do a reflash but... idk kinda worried. I have a 4/96 base.

I've been tracking my mileage for several years, but I haven't compiled the numbers since I did the Dinan software last year. I'll do it this evening and see if there's been a change.

Maybe you are stomping on the gas more?

Here and there, but I've run a few tanks real chill to test. Drove to and from LA last weekend and saw a loss on the highway compared to my last LA-PHX drive. A couple MPG. Not detrimental, but was a little shocked since everyone, including the installer, talked about an increase.

I have much better software then Dinan and one of my focused area's was to make sure that fuel economy was not compromised while under part throttle load and still have better/smoother acceleration in all conditions

However if you are pushing the gas and doing many WOT pulls you can forget the fuel economy on any tune ;)

It is also possible your O2 sensors are getting slow and this will cause economy problems of course
check your battery conditions and charging voltage off the alternator
Also check your spark plugs for excessive carbon build up

Have the dealer reset the emissions adaption routine for the DME

best of luck!

Thanks for the info Barrie. Do you have tuning software for a 96 ti now? I emailed you a month ago or so and you said you had nothing. That's what got me looking into the Dinan.

Hmmm don't know why I would have said that? I have had performance software for the M44 for along time... Maybe I was mis reading your email ? forward to me if you can

Thanks!

Sounds good, doing so in a couple minutes.

So here's the verdict:
199 tanks of gas pre-Dinan software = 29.17 mpg average
30 tanks of gas with Dinan software = 29.83 mpg average

Obviously the sample size without the software is much bigger. Looking at the numbers there is a pattern of lower mpg for the few tanks immediately following the install. I'll attribute that to the "new toy" effect as it started to creep back up after a while. I'll have to keep an eye on it going forward, but for me at least it looks like it's a very slight increase but nothing to get excited about. Your mileage may vary, literally.

I have been driving the 95 club sport around the past 2 weeks. It has the Dinan chip. I got 25 mpg but that is literally all in town 5 miles at a time.