Working out fuel consumption

I am trying to work out a way of calculating fuel consumption over a given time period.
All fuel issues are entered into a form.
The date,vehicle fleet no,fuel issue amount(litres) & mileage(some vehicles are in miles,some in kilometres)
I was hoping to be able to create a report that would allow any vehicle to be selected, any time range & it would show the the miles per gallon.
I hope somebody can help
Thanks
zoellermanAsked:
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Krys_WilsonConnect With a Mentor Commented:
Zoellerman,

To create the calculations you will need Amount of fuel used (Not just issue amount) and mileage used.  This data can be calculated if you have Fuel Issue amount and Fuel Amount(Amt of fuel at end of trip) and also Begining Mileage and Ending Mileage.

If you have that then you can easily create a report.  If not, you may need to add that data to the tables before this can be done.

Chris
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ala_frostyCommented:
First off, each Fuel Issue MUST fill the tank. Secondly, you never fill a vehicle twice in the same day. If you do, you need to add a new field to your table that would be a unique identifier, or start recording the time along with the date (preferrable I would say).

Let's say your table is named tblFuelIssue

Query1: [Here's where you pick out the fleet cars and the date of the current fill along with the date of the most recent fill]
SELECT FL.FleetNumber, Max(FL.IssueDate) AS FLissueDate, FH.IssueDate AS FHIssueDate
FROM tblFuel AS FL INNER JOIN tblFuel AS FH ON FL.FleetNumber = FH.FleetNumber
WHERE (((FL.IssueDate)<[FH].[IssueDate]))
GROUP BY FL.FleetNumber, FH.IssueDate;

Query2: [Here's where you pull the issue records based on which ones match up with the ones selected in Query1.
SELECT Query1.FleetNumber, Query1.FHIssueDate AS [Date], [FH].[odometer]-[Fl].[Odometer] AS Miles, FH.fuel AS FuelConsumed, IIf([FuelConsumed]=0,Null,[Miles]/[FuelConsumed]) AS mileage
FROM (Query1 INNER JOIN tblFuel AS FL ON (Query1.FLissueDate = FL.IssueDate) AND (Query1.FleetNumber = FL.FleetNumber)) INNER JOIN tblFuel AS FH ON (Query1.FHIssueDate = FH.IssueDate) AND (Query1.FleetNumber = FH.FleetNumber);

I could show you how to do it in one query, but Access REALLY hates using them, so best just to leave it as two.

Stephen
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sparabCommented:
Use follwing simple function for your reports

Elapsed time = Format$(EndTime - StartTime, "HH:MM:SS")

Regards
Sparab
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