Trish ;
You made some mistake in the calculations is a NA W-123 chassis car , never , _EVER_ gets 37 MPG's when driven over 1/2 throttle or above 60 MPH for multiple reasons .
As soon as you exceed 60 MPH , the brick like aerodynamics of the chassis come into play and the fuel mileage drops like a stone .
Flat footing it also wastes large amount of fuel .
The DPO telling you he got 47 MPG's means he's a FLAT LIAR and cannot be trusted to have done anything in maintenance he claims he did , yes many have access to blank invoices and cobble them up to raise the resale value of an used car , sad but true .
On the flat , your NA 300D should be peppy off the line from a dead stop and not run out of power until about 50 MPH .
If not , it is tune up time .
-Nate
Trish wrote:
>
> How did you measure?
>
> I wrote down the gallons I put in & the mileage at the time.
>
> First fueling; 277090 & 13.24 gallons. Next fueling 277403 & 8.57 gallons.
> Subtract you get 313 miles divided by 8.57 gallons comes out to 36.5 mpg.
>
> Next fueling 277606 & 11.38 gallons. Comes to 203 miles divided by 11.38
> comes out to 17.84.
>
> Trish
>
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