ecarecar wrote:
> Is there something not-too-expensive I could plug in to get the data for
> myself?
>
>
> ecarecar wrote:
>
>> I am looking for a plot of engine speed vs. fuel consumption. Is one
>> available anywhere? I am not at all picky about what specific engine.

c'mon dude - you need to be much more precise with your questions to get
meaningful answers.

1. do you mean engine speed or vehicle speed?
2. what kind of engine?
3. what kind of fuel?

there's more, and it's a long list of highly significant variables.

as for plug-ins, yes, you can use obd output data to compute
consumption, if you know some other data, but it's a non-trivial
exercise, and without knowing a /lot/ more detail, you're pretty much
stuck with getting gas station receipt data, recording mileage between
each fill-up, then driving different speeds.